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Stock-Based Compensation - Restricted Stock Units (Details) - LTIP Program - Restricted stock units
6 Months Ended
Jun. 30, 2017
$ / shares
shares
Stock-based compensation  
Period for recognition 3 years
Granted (in shares) 124,780
Granted (in dollars per share) | $ / shares $ 34
Forfeited (in shares) 0
Minimum  
Stock-based compensation  
Award vesting rights, percentage 0.00%
Maximum  
Stock-based compensation  
Award vesting rights, percentage 200.00%