Compensation Plans Outstanding Longer Term Incentive Awards (Details) - USD ($) $ / shares in Units, $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Outstanding Long Term Incentive Awards [Line Items] | ||
| Target Shares Issuable as Long Term Incentive Awards | $ 126,000 | $ 107,642 |
| Maximum Shares Issuable as Long Term Incentive Awards | 157,250 | 141,577 |
| Unrecognized Compensation Cost - Long Term Incentives | $ 1,454,417 | $ 745,873 |
| Share-based Compensation Arrangement By Share-based Payment Award, Grants In Period, Weighted Average Grant Date Fair Value | $ 19,210 | $ 16,840 |