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Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Transition adjustment for accounting standard adoption   $ 0  
Operating right-of-use lease assets $ 133,365   $ 0
Operating lease liability $ 137,448    
Accounting Standards Update 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating right-of-use lease assets   140,000  
Operating lease liability   147,000  
Tax Rate Reduction Related To Pension Liability | Accounting Standards Update 2018-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Transition adjustment for accounting standard adoption   700  
Tax Effect Of Tax Reform On Items Remaining In AOCI, Currency Translation | Accounting Standards Update 2018-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Transition adjustment for accounting standard adoption   1,700  
Distributions In Excess Of Earnings | Accounting Standards Update 2018-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Transition adjustment for accounting standard adoption   $ 1,000