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Equity (Details) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended
	May 09, 2018	Apr. 05, 2018	Mar. 15, 2018	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash dividends declared per common share (in dollars per share)			$ 0.035	$ 0.035	$ 0.858
Payments of dividends				$ 0	$ 550,000
Reclassification from AOCI				0
Accumulated deficit				(1,148,059)		$ (963,782)	$ (998,212)
Subsequent Event
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash dividends declared per common share (in dollars per share)	$ 0.035
Common stock dividends paid (in dollars per share)		$ 0.035
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accumulated deficit				$ 39,535		$ 34,430

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Aggregate dividends paid during the period for each share of common stock outstanding.

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