Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Details 2)

v3.6.0.2
Stockholders' Equity (Details 2) - Restricted Stock
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Shares [Rollforward]  
Nonvested at Beginning of Period (shares) | shares 130,749
Granted (shares) | shares 234,855
Vested (shares) | shares (54,421)
Forfeited (shares) | shares (2,483)
Nonvested at End of Period (shares) | shares 308,700
Weighted-Average Grant Date Fair Value [Roll Forward]  
Nonvested at Beginning of Period (in usd per share) | $ / shares $ 60.36
Granted (in usd per share) | $ / shares 95.31
Vested (in usd per share) | $ / shares 66.79
Forfeited (in usd per share) | $ / shares 67.95
Nonvested at End of Period (in usd per share) | $ / shares $ 86.61