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Fair Value Measurements - Assets and Liabilities Recorded at Fair Value (Details) - Fair Value Based on Significant Other Observable Inputs (Level 2) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets: |  |
Cash surrender value of life insurance policies | $ 34,699 | $ 33,747
Cash flow swaps and interest rate caps designated as hedges | 8,604 | 5,968
Total assets | 43,303 | 39,715
Liabilities: |  |
Cash flow swaps and interest rate caps designated as hedges | 0 | 1,286
Deferred compensation plan | 20,412 | 18,417
Total liabilities | 20,412 | 19,703
Other current assets |  |
Assets: |  |
Cash flow swaps and interest rate caps designated as hedges | 2,000 | 900
Other assets |  |
Assets: |  |
Cash flow swaps and interest rate caps designated as hedges | $ 6,600 | 5,100
Other accrued liabilities |  |
Liabilities: |  |
Cash flow swaps and interest rate caps designated as hedges |  | 1,000
Other long-term liabilities |  |
Liabilities: |  |
Cash flow swaps and interest rate caps designated as hedges |  | $ 300

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