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Commitments and Contingencies Commitments and Contingencies - Income Tax Reserve (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]      
Liability for Uncertain Tax Positions, Noncurrent $ 900 $ 900 $ 900
Deferred Rent Credit, Current 500 300  
Costs and Expenses, Related Party $ 1,300 $ 1,300 $ 1,300