Annual report pursuant to Section 13 and 15(d)

Schedule I - Condensed Statement of Cash Flow (Details)

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Schedule I - Condensed Statement of Cash Flow (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:                      
Net income (loss) $ 28,119 $ 14,185 $ 15,782 $ 214 $ 65,011 $ (3,345) $ (1,609) $ (2,454) $ 58,300 $ 57,603 $ (79,746)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:                      
Stock compensation                 19,464 8,799 5,432
Net cash provided by operating activities                 248,644 165,173 122,708
Cash flows from investing activities:                      
Net cash used in investing activities                 (119,290) (195,982) (1,915,763)
Cash flows from financing activities:                      
IPO proceeds                 0 507,500 0
IPO costs                 0 (26,804) 0
Net cash (used in) provided by financing activities                 (137,225) 19,833 1,858,445
Cash, cash equivalents and restricted cash at beginning of period       66,195       70,742 66,195 70,742  
Cash, cash equivalents and restricted cash at end of period 57,854       66,195       57,854 66,195 70,742
Parent Company                      
Cash flows from operating activities:                      
Net income (loss)                 58,300 57,603 (79,746)
Equity in net (income) loss from subsidiaries                 (77,764) (66,402) 72,717
Adjustments to reconcile net income (loss) to net cash provided by operating activities:                      
Stock compensation                 19,464 8,799 7,029
Net cash provided by operating activities                 0 0 0
Cash flows from investing activities:                      
Investment in subsidiaries                 0 (480,696) 0
Net cash used in investing activities                 0 (480,696) 0
Cash flows from financing activities:                      
IPO proceeds                 0 507,500 0
IPO costs                 0 (26,804) 0
Net cash (used in) provided by financing activities                 0 480,696 0
Effect of exchange rate changes on cash, cash equivalents and restricted cash                 0 0 0
Net change in cash, cash equivalents and restricted cash                 0 0 0
Cash, cash equivalents and restricted cash at beginning of period       $ 0       $ 0 0 0 0
Cash, cash equivalents and restricted cash at end of period $ 0       $ 0       $ 0 $ 0 $ 0