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Stock-based Compensation - Performance Unit Awards - General Information (Details) - Performance Unit Awards
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
Stock-based Compensation  
Performance period (in years) 3 years
Estimated final value upon vesting | $ $ 1.3
Fair value | $ $ 1.2
Minimum  
Stock-based Compensation  
Vested (in dollars per share) | $ / shares $ 0.00
Maximum  
Stock-based Compensation  
Vested (in dollars per share) | $ / shares $ 200.00