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Other Long-Term Liabilities
 9 Months Ended
Sep. 30, 2019
Other Liabilities Disclosure [Abstract]  
Other Long-Term Liabilities Other Long-Term Liabilities
Other long-term liabilities consisted of the following (in thousands):
September 30, 2019December 31, 2018
Deferred compensation plan $28,376  $25,672  
Supplemental executive retirement plan15,681  15,035  
Operating lease liabilities14,124  —  
Interest rate swap derivative instrument265  —  
Other long-term liabilities704  2,802  
Total Other long-term liabilities$59,150  $43,509