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Related-Party Transactions (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Related Party Transaction [Line Items]            
Deferred compensation   $ 4,050   $ 4,050   $ 27,322
Fair value of common stock   25   25   839
Paid out $ 23,400          
Deferred compensation expense   $ 287 $ 860 $ 205 $ 1,100  
Chief Executive Officer            
Related Party Transaction [Line Items]            
Severance           $ 10,400