Income Taxes - Narrative (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Tax Disclosure [Abstract]    
Effective tax rate 16.40% (167.90%)
Income tax expense (benefit) $ (1,974,000) $ 3,528,000
Discrete tax benefit related to dispositions on incentive stock options $ (1,000,000) $ (800,000)