Provision (Benefit) for Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliations of income taxes computed using the U.S. Federal statutory rate to the effective income tax rates
Income taxes (or benefits) computed at U.S. statutory rate -35%	$ (9,032)	$ 12,803	$ 47,282
State tax provisions (benefits), net of federal benefits	(496)	(964)	(1,158)
Non-deductible equity compensation	1,127	1,911	1,537
Stock-based compensation tax shortfall	558
Valuation allowance of carryover tax assets	385	2,370	2,273
Expired Operating Loss Carryovers	400
Uncertain Tax Positions		(977)
Other, net	285	496	560
Income tax provision (benefit)	$ (6,773)	$ 15,639	$ 50,494
Effective rate	26.20%	42.80%	37.40%