Basis of Presentation, Summary of Significant Accounting Policies and Change in Accounting Principle - Change in Accounting Principle (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Jan. 01, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in retained earnings	$ (128,605)		$ (146,617)
Increase in net income (loss)	$ (23,149)	$ (173,811)	$ (226,778)
Election to Recognize Share-based Award Forfeitures As They Occur
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in retained earnings				$ 500
ASU 2016-09 | Election to Recognize Share-based Award Forfeitures As They Occur
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in net income (loss)		$ 100