XML 95 R81.htm IDEA: XBRL DOCUMENT v3.10.0.1
Capital Stock and Share-Based Compensation - Restricted Stock Units Issued and Outstanding (Details) - 2010 Incentive Award Plan - Restricted Stock Units (RSUs)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Restricted Stock Units  
Unvested, Beginning Balance | shares 614
Granted | shares 130
Vested | shares (188)
Forfeited | shares (27)
Unvested, Ending Balance | shares 529
Expected to vest at end of period | shares 509
Weighted Average Grant Date Fair Value  
Unvested, Beginning Balance | $ / shares $ 18.35
Granted | $ / shares 55.27
Vested | $ / shares 18.77
Forfeited | $ / shares 24.53
Unvested, Ending Balance | $ / shares 26.98
Expected to vest at end of period | $ / shares $ 26.31
Weighted Average Remaining Vesting Period (in years)  
Unvested at end of period 1 year 7 months 2 days
Expected to vest at end of period 1 year 7 months 2 days
Aggregate Intrinsic Value  
Unvested at end of period | $ $ 33,308 [1]
Expected to vest at end of period | $ $ 32,041 [1]
[1] The aggregate intrinsic value is calculated based on the fair value of $63.00 per share of the Company’s common stock on December 31, 2018 due to the fact that the restricted stock units carry a $0 purchase price.