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Other Long-Term Liabilities (Tables)
 6 Months Ended
Jun. 30, 2019
Other Liabilities Disclosure [Abstract]  
Schedule of Other Long-Term Liabilities
Other long-term liabilities consisted of the following (in thousands):
June 30, 2019December 31, 2018
Deferred compensation plan $27,857 $25,672 
Supplemental executive retirement plan15,466 15,035 
Operating lease liabilities10,941 — 
Interest rate swap derivative instrument115 — 
Other long-term liabilities1,231 2,802 
Total Other long-term liabilities$55,610 $43,509