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Earnings per Share (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($) $ / shares shares	Sep. 30, 2016 USD ($) $ / shares shares	Sep. 30, 2017 USD ($) $ / shares shares	Sep. 30, 2016 USD ($) $ / shares shares	Dec. 31, 2016 USD ($)
Earnings per share
Capped Call, cap price | $ / shares	$ 60.00		$ 60.00
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	506	78	193
Calculation of basic and diluted earnings per share
Net loss | $	$ (89,112)	$ (40,907)	$ (134,585)	$ (556,798)
Basic weighted-average common shares outstanding	111,575	78,468	111,366	71,574
Add: dilutive effect of non-vested RSUs and contingent PSUs	0	0	0	0
Add: dilutive effect of Senior Convertible Notes	0	0	0	0
Diluted weighted-average common shares outstanding	111,575	78,468	111,366	71,574
Basic net loss per common share | $ / shares	$ (0.80)	$ (0.52)	$ (1.21)	$ (7.78)
Diluted net loss per common share | $ / shares	$ (0.80)	$ (0.52)	$ (1.21)	$ (7.78)
Performance Shares [Member]
Earnings per share
Multiplier Applied to PSU Awards at Settlement			0
Minimum [Member] | Performance Shares [Member]
Earnings per share
Multiplier Applied to PSU Awards at Settlement			0.00
Maximum [Member] | Performance Shares [Member]
Earnings per share
Multiplier Applied to PSU Awards at Settlement			2.00
1.50% Senior Convertible Notes Due 2021 [Member]
Earnings per share
Senior Convertible Notes, face amount | $	$ 172,500		$ 172,500		$ 172,500
Senior Convertible Notes, conversion price | $ / shares	$ 40.50		$ 40.50
Convertible Debt [Member] | 1.50% Senior Convertible Notes Due 2021 [Member]
Earnings per share
Senior Convertible Notes, face amount | $	$ 172,500		$ 172,500		$ 172,500

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