Stock-Based Compensation Stock Based Compensation (RSU) Details 2 (Details) - 6 months ended Jun. 30, 2015 - $ / shares
|
Total |
| Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |
|
| RSUs granted |
2,041,106
|
| Restricted Stock Units (RSUs) [Member] |
|
| Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |
|
| RSU Shares Outstanding, Beginning of Period |
2,818,661
|
| RSUs granted |
2,041,106
|
| RSUs vested |
(357,242)
|
| RSUs forfeited |
(79,987)
|
| RSU Shares Outstanding, End of Period |
4,422,538
|
| 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 |
102.12
|
| Weighted Average Fair Value, RSUs vested, USD per share |
82.42
|
| Weighted Average Fair Value, RSUs forfeited, USD per share |
82.48
|
| Weighted Average Fair Value, End of Period, USD per share |
$ 88.54
|