Income Taxes - Allocation of Tax Expense (Benefit) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Income tax (benefit) expense	$ (409)	$ 387	$ (55,658)
Excess tax expense on stock-based compensation			907
Deferred tax expense on accumulated other comprehensive income			7,888
Total			8,795
Total income tax (benefit) expense	$ (409)	$ 387	$ (46,863)