Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (ResSt) (Details)

v3.7.0.1
Stock-Based Compensation (ResSt) (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2017
USD ($)
item
$ / shares
shares
Restricted Stock  
Stock-Based compensation  
Award vesting rights proportion (as a percent) 33.00%
Number of vesting rights anniversaries | item 3
Number of Shares  
Balance at the beginning of the period (in shares) | shares 1,894,759
Granted (in shares) | shares 872,941
Vested (in shares) | shares (526,572)
Forfeited (in shares) | shares (20,084)
Balance at the end of the period (in shares) | shares 2,221,044
Weighted-Average Grant Date Fair Value per Share  
Balance at the beginning of the period (in dollars per share) | $ / shares $ 30.40
Granted (in dollars per share) | $ / shares 31.89
Vested (in dollars per share) | $ / shares 31.68
Forfeited (in dollars per share) | $ / shares 27.52
Balance at the end of the period (in dollars per share) | $ / shares $ 31.98
Additional disclosures  
Unrecognized compensation expense related to shares | $ $ 64,056
Unrecognized compensation expense weighted-average recognition period 2 years 4 months 24 days
Stock Options  
Additional disclosures  
Unrecognized compensation expense weighted-average recognition period 2 years 3 months 18 days