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Stock-Based Compensation and Similar Arrangements - Performance Share, Fair Value Assumptions (Details) - Performance Shares - HoldCo LTI Program
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Expected Volatility 40.00%
Dividend Yield 0.00%
Fair Value of Total Pool $ 12,870
Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Forward interest rate 0.24%
Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Forward interest rate 2.71%