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Debt Commitments and Contingencies - Note Payable Under Asset Purchase Agreement (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Dec. 07, 2015
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
installment_payment
Dec. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]            
Consideration for asset purchase agreement $ 27,000          
Cash paid for asset purchase agreement       $ 5,000 $ 12,000  
Debt       390,000 365,000 $ 365,000
Non-cash investing and financing activity           15,000
Note Payable Under Asset Purchase Agreement [Member]            
Debt Instrument [Line Items]            
Debt       $ 10,000 $ 15,000 $ 15,000
Number of installment payments | installment_payment       2    
Fixed interest rate per annum       0.56%    
Scenario, Forecast [Member]            
Debt Instrument [Line Items]            
Cash paid for asset purchase agreement   $ 5,000 $ 5,000