Income Taxes - Reconciliation of Unrecognized Tax Benefit (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Total unrecognized benefits recorded as a reduction to deferred tax assets		$ 11,900,000
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at December 31, 2012	10,277,000
Increase in prior period positions	1,945,000
Increase in current period positions	412,000
Balance at December 31, 2013	$ 12,634,000