Derivative and Nonderivative Hedging Instrument Fair Value Disclosure (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Asset Derivatives [Abstract]
Gross Amounts of Recognized Assets Presented in the Consolidated Balance Sheets	$ 4,532	$ 2,900
Liability Derivatives [Abstract]
Total liability derivatives	356	289
Not Designated as Hedging Instrument [Member] \| Other Current Assets [Member]
Asset Derivatives [Abstract]
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value	44	41
Not Designated as Hedging Instrument [Member] \| Other Current Liabilities [Member]
Liability Derivatives [Abstract]
Foreign exchange forward contracts	356	289
Interest Rate Swap [Member] \| Designated as Hedging Instrument [Member] \| Other Current Assets [Member]
Asset Derivatives [Abstract]
Interest Rate Derivative Assets, at Fair Value	1,303	658
Interest Rate Swap [Member] \| Designated as Hedging Instrument [Member] \| Other Noncurrent Assets [Member]
Asset Derivatives [Abstract]
Interest Rate Derivative Assets, at Fair Value	2,226	1,712
Interest Rate Cap [Member] \| Designated as Hedging Instrument [Member] \| Other Current Assets [Member]
Asset Derivatives [Abstract]
Interest Rate Derivative Assets, at Fair Value	74	17
Interest Rate Cap [Member] \| Designated as Hedging Instrument [Member] \| Other Noncurrent Assets [Member]
Asset Derivatives [Abstract]
Interest Rate Derivative Assets, at Fair Value	310	179
Interest Rate Cap [Member] \| Not Designated as Hedging Instrument [Member] \| Other Current Assets [Member]
Asset Derivatives [Abstract]
Interest Rate Derivative Assets, at Fair Value	111	25
Interest Rate Cap [Member] \| Not Designated as Hedging Instrument [Member] \| Other Noncurrent Assets [Member]
Asset Derivatives [Abstract]
Interest Rate Derivative Assets, at Fair Value	$ 464	$ 268

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value as of the balance sheet date of all foreign currency derivative assets not designated as hedging instruments.

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Fair value as of the balance sheet date of all foreign currency derivative liabilities not designated as hedging instruments.

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Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets.

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