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Other Long-Term Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Other Liabilities Disclosure [Abstract]    
Deferred compensation plan $ 28,376 $ 25,672
Supplemental executive retirement plan 15,681 15,035
Operating lease liabilities 14,124 0
Interest rate swap derivative instrument 265 0
Other long-term liabilities 704 2,802
Total Other long-term liabilities $ 59,150 $ 43,509