Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Treasury Stock	Retained Earnings (Deficit)	Total
Beginning Balance (in shares) at Dec. 31, 2012	43,500,032
Beginning Balance at Dec. 31, 2012	$ 435	$ 359,160	$ (16,388)	$ 29,203	$ 372,410
Issuances of restricted stock		(6,751)	6,751
Amortization of share-based compensation		11,830			11,830
Purchase of treasury stock			(3,605)		(3,605)
Exercise of stock options / vesting of restricted stock		(565)	1,146		581
Net income (loss)				(35,929)	(35,929)
Ending Balance (in shares) at Dec. 31, 2013	43,500,032
Ending Balance at Dec. 31, 2013	$ 435	363,674	(12,096)	(6,726)	345,287
Issuances of restricted stock		(9,583)	9,583
Amortization of share-based compensation		14,714			14,714
Purchase of treasury stock			(12,733)		(12,733)
Exercise of stock options / vesting of restricted stock		1,115	2,611		3,726
Net income (loss)				(8,341)	(8,341)
Ending Balance (in shares) at Dec. 31, 2014	43,500,032
Ending Balance at Dec. 31, 2014	$ 435	369,920	(12,635)	(15,067)	342,653
Issuances of restricted stock		(3,779)	3,779
Amortization of share-based compensation		13,728			13,728
Purchase of treasury stock			(5,742)		(5,742)
Exercise of stock options / vesting of restricted stock		(5,140)	2,584		(2,556)
Net income (loss)				(241,745)	(241,745)
Ending Balance (in shares) at Dec. 31, 2015	43,500,032
Ending Balance at Dec. 31, 2015	$ 435	$ 374,729	$ (12,014)	$ (256,812)	$ 106,338