Organization, Basis of Presentation and Recent Accounting Pronouncements (Recent Accounting Pronouncements) (Narrative) (Details) - USD ($) $ in Thousands |
Mar. 31, 2019 |
Jan. 01, 2019 |
Dec. 31, 2018 |
---|---|---|---|
New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |||
Lease Right-of-Use Assets | $ 382,050 | $ 369,333 | $ 0 |
Total lease liabilities | $ 420,077 | ||
Accounting Standards Update 2016-02 [Member] | |||
New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |||
Lease Right-of-Use Assets | 369,333 | ||
Total lease liabilities | $ 418,300 |