Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Assets and Liabilities Recorded at Fair Value (Details)

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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