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Fair Value Measurements - Assets and Liabilities Recorded at Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Other current assets |  |
Assets: |  |
Cash flow swaps and interest rate caps designated as hedges | $ 1,300 | $ 900
Other assets |  |
Assets: |  |
Cash flow swaps and interest rate caps designated as hedges | 6,700 | 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
Fair Value Based on Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Cash surrender value of life insurance policies | 33,996 | 33,747
Cash flow swaps and interest rate caps designated as hedges | 8,013 | 5,968
Total assets | 42,009 | 39,715
Liabilities: |  |
Cash flow swaps and interest rate caps designated as hedges | 0 | 1,286
Deferred compensation plan | 19,454 | 18,417
Total liabilities | $ 19,454 | $ 19,703

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