Series A Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Jan. 27, 2014	Dec. 31, 2015	Dec. 31, 2014
Series A Preferred Stock [Abstract]
Series A preferred shares, issued	200,000	200,000	200,000
Anti-dilutive Series A preferred shares not included in the calculation of EPS		13,793,100
Gross purchase price	$ 198,000
Gross purchase price per share	$ 990.00
Net proceeds from sale of series A preferred stock	$ 182,200
Issuance discount	2,000
Direct issuance expenses	$ 15,800
Stated value of preferred shares per share		$ 1,000
Dividend rate		6.00%
Penalty dividend rate		8.00%
Accrued dividends		$ 3,000	$ 3,067
Conversion price per share at option of holder		$ 14.50
Conversion price per share at option of company		$ 29.00
Number of consecutive trading days		20 days
Percent Of Stated Value		100.00%
Series A preferred shares, redemption amount		$ 203,000	$ 203,067
Maximum percent of stated value		101.00%
Preferred Stock, Redemption Period		8 years