|
Stock-Based Compensation Stock Based Compensation (RSU) Details 2 (Details) (USD $)
|
3 Months Ended |
|
Mar. 31, 2015
|
| Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |
|
| RSUs granted |
1,599,278 |
| Restricted Stock Units (RSUs) [Member] |
|
| Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |
|
| Shares Outstanding, Beginning of Period |
2,818,661 |
| RSUs granted |
1,599,278 |
| RSUs Vested |
(210,353) |
| RSUs forfeited |
(40,020) |
| Shares Outstanding, End of Period |
4,167,566 |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Weighted Average Exercise Price [Roll Forward] |
|
| Weighted Average Fair Value, Beginning of Period, USD per share |
77.77 |
| Weighted Average Fair Value, RSUs granted, USD per share |
99.90 |
| Weighted Average Fair Value, RSUs vested, USD per share |
91.66 |
| Weighted Average Fair Value, RSUs forfeited, USD per share |
80.81 |
| Weighted Average Fair Value, End of Period, USD per share |
85.53 |