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Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Effective tax rate on pre-tax losses			15.70%	3.70%
Pre tax losses	$ (26,553)	$ 2,364	$ (98,659)	$ (196,159)
Unrecognized tax benefits	0	17,604	0	17,604	$ 16,994	$ 32,548
Accrued interest and penalties related to unrecognized tax benefits	$ 0	$ 6,100	$ 0	$ 6,100

X

- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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- Definition

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of unrecognized tax benefits.

+ References

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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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