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Long-Term Debt - Derivative Instruments and Hedging Activities (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Derivatives, Fair Value [Line Items] |  |  |  |  |
Incremental interest expense | $ 0 | $ 700,000 | $ 100,000 | $ 1,900,000 |
Net benefit expected to be reclassified | 1,800,000 |  | 1,800,000 |  |
Interest rate swap and interest rate cap | Derivative instruments and hedging activities |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Net cash proceeds |  |  | 4,800,000 |  |
Derivative, Fair Value, Net | 8,000,000 |  | 8,000,000 |  | $ 4,700,000
Interest rate swap and interest rate cap | Derivative instruments and hedging activities | Other assets |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative asset, fair value of interest rate swap and cap positions | 6,700,000 |  | 6,700,000 |  | 5,100,000
Interest rate swap and interest rate cap | Derivative instruments and hedging activities | Other current assets |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative asset, fair value of interest rate swap and cap positions | $ 1,300,000 |  | $ 1,300,000 |  |
Interest rate swap | Derivative instruments and hedging activities | Other current assets |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative liability, fair value of interest rate swap and cap positions |  |  |  |  | 900,000
Interest rate swap | Derivative instruments and hedging activities | Other accrued liabilities |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative liability, fair value of interest rate swap and cap positions |  |  |  |  | 1,000,000
Interest rate swap | Derivative instruments and hedging activities | Other long-term liabilities |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative liability, fair value of interest rate swap and cap positions |  |  |  |  | $ 300,000

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