Income Taxes - Unrecognized Tax Benefit Activity (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 1,300,000
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits - Balance at beginning of year	1,553,000	1,539,000	1,621,000
Change in valuation amount	0	0	64,000
Expiration of the statute of limitations for the assessment of taxes	0	(55,000)	(252,000)
Increases related to current year tax positions	0	64,000	81,000
Increases related to prior year tax positions	0	5,000	25,000
Unrecognized Tax Benefits - Balance at end of year	$ 1,553,000	$ 1,553,000	$ 1,539,000