Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation and Cash-Based Incentive Compensation - Summary of Share Activity Related to Restricted Stock Units (Details)

v3.3.0.814
Share-Based Compensation and Cash-Based Incentive Compensation - Summary of Share Activity Related to Restricted Stock Units (Details) - Restricted Stock Units (RSUs)
9 Months Ended
Sep. 30, 2015
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Nonvested, beginning of period | shares 1,977,335
Vested | shares (23,500)
Forfeited | shares (114,900)
Nonvested, end of period | shares 1,838,935
Weighted Average Grant Date Value, Beginning of period $ 15.29
Weighted Average Grant Date Fair Value, Vested 14.68
Weighted Average Grant Date Fair Value, Forfeited 15.18
Weighted Average Grant Date Value, End of period $ 15.30