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Equity Compensation (Restricted Stock Units) (Details) - Restricted stock units
9 Months Ended
Sep. 30, 2018
$ / shares
shares
Restricted stock units  
Non-vested balance at beginning of period (in shares) 1,290,660
Awarded 461,350
Vested (743,514)
Forfeited (53,880)
Non-vested balance at end of period (in shares) 954,616
Weighted Average Grant Date Fair Value  
Non-vested balance at beginning of period (in dollars per share) | $ / shares $ 9.75
Awarded (in dollars per share) | $ / shares 28.46
Vested (in dollars per share) | $ / shares 10.04
Forfeited (in dollars per share) | $ / shares 11.18
Non-vested balance at end of period (in dollars per share) | $ / shares $ 18.49
Shares withheld for tax purposes (in shares) 242,531
Issuance of shares net of shares withheld (in shares) 500,983