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Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Anti-dilutive securities excluded from earnings per share	0			2,433			707	0
Calculation of basic and diluted earnings per share
Net income (loss)	$ 42,234	$ 50,388	$ (177,568)	$ (135,923)	$ 17,197	$ 317,401	$ (84,946)	$ 198,675
Basic weighted-average common shares outstanding	112,804			112,107			112,441	111,836
Dilutive effect of non-vested RSUs and contingent PSUs	530			0			0	1,764
Diluted weighted-average common shares outstanding	113,334			112,107			112,441	113,600
Basic net income (loss) per common share	$ 0.37			$ (1.21)			$ (0.76)	$ 1.78
Diluted net income (loss) per common share	0.37			(1.21)			(0.76)	1.75
1.50% Senior Convertible Notes Due 2021 [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Senior Convertible Notes, conversion price	$ 40.50			$ 40.50			$ 40.50	$ 40.50

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