XML 20 R57.htm IDEA: XBRL DOCUMENT v2.4.0.6
Stock-Based Compensation (Nonvested Service Based Restricted Stock Units) (Details) (Restricted Stock Units (RSUs) [Member], USD $)
3 Months Ended
Mar. 31, 2013
Y
Restricted Stock Units (RSUs) [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Nonvested at beginning of period 563,106
Number of Shares, Granted 416,098
Number of Shares, Vested (106,227)
Number of Shares, Forfeited (7,186)
Number of Shares, Nonvested at end of period 865,791
Number of Shares, Vested and expected to vest 778,925
Number of Shares, Vested at end of period 0
Weighted-Average Vest Date, Nonvested at beginning in years 9 months 15 days
Weighted-Average Vest Date, Nonvested at end in years 1 year 0 months 11 days
Weighted-Average Vest Date, Vested and expected to vest in years 11 months 1 day
Weighted-Average Vest Date, Vested in years 0
Weighted-Average Grant Date Fair Value, Nonvested at beginning of period $ 21.14
Weighted-Average Grant Date Fair Value, Granted $ 11.06
Weighted-Average Grant Date Fair Value, Vested $ 11.99
Weighted-Average Grant Date Fair Value, Forfeited $ 13.55
Weighted-Average Grant Date Fair Value, Nonvested at end of period $ 17.48