Long-Term Incentive Plan (Equity-Based Incentive Compensation Expense) (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Long Term Incentive Plan [Line Items] | |||
| Allocation of LTIP expense on Consolidated Statements of Income | $ 24,012 | $ 32,053 | $ 20,641 |
| Performance Shares [Member] | |||
| Long Term Incentive Plan [Line Items] | |||
| Allocation of LTIP expense on Consolidated Statements of Income | 17,920 | 28,728 | 17,823 |
| Time-Based Awards [Member] | |||
| Long Term Incentive Plan [Line Items] | |||
| Allocation of LTIP expense on Consolidated Statements of Income | $ 6,092 | $ 3,325 | $ 2,818 |