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Earnings per Share - Reconciliation of Earnings Per Share Data (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net (loss)	$ (80,660)	$ 47,670	$ (111,599)	$ (82,181)	$ (215,038)	$ (70,140)	$ (87,984)	$ (28,747)	$ (226,770)	$ (401,909)	$ (24,550)
Net (Loss), basic and diluted (in dollars per share)									$ (1.80)	$ (3.21)	$ (0.20)
Weighted average basic and diluted shares outstanding									125,977	125,383	124,790
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Shares omitted from the calculation of (loss) per share (in shares)									7,000	5,000	3,600
Stock Options
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Shares omitted from the calculation of (loss) per share (in shares)									4,736	3,686	3,035
Restricted Stock Units and Performance Stock Units
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Shares omitted from the calculation of (loss) per share (in shares)									2,305	1,296	527