Equity (Convertible Obligation to Series C Convertible Preferred Stockholders) (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Class of Stock [Line Items]
Convertible preferred stock, shares outstanding (shares)	42,834,138	42,834,138
Shares converted into common stock (shares)			829,629
Cash redemption of preferred stock	$ 0	$ 316,126	$ 0
Series C Preferred Stock [Member]
Class of Stock [Line Items]
Convertible preferred stock, shares outstanding (shares)			28,400,000
Gross proceeds			$ 445,000
Shares converted into common stock (shares)			1,400,000
Cash redemption of preferred stock			$ 441,400