Derivative Financial Instruments Derivative and Nonderivative Hedging Instrument Fair Value Disclosure (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Asset Derivatives [Abstract]
Derivative Asset	$ 2,945	$ 3,082
Liability Derivatives [Abstract]
Derivative Liability	1,383	967
Designated as Hedging Instrument [Member] \| Other Noncurrent Assets [Member] \| Interest Rate Cap [Member]
Derivatives, Fair Value [Line Items]
Interest Rate Cash Flow Hedge Asset at Fair Value	376	1,423
Designated as Hedging Instrument [Member] \| Other Noncurrent Assets [Member] \| Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Interest Rate Cash Flow Hedge Asset at Fair Value	1,830	1,632
Designated as Hedging Instrument [Member] \| Other Current Assets [Member] \| Interest Rate Cap [Member]
Derivatives, Fair Value [Line Items]
Interest Rate Cash Flow Hedge Asset at Fair Value	3	0
Designated as Hedging Instrument [Member] \| Other Current Liabilities [Member] \| Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Interest Rate Cash Flow Hedge Asset at Fair Value	934	868
Not Designated as Hedging Instrument [Member] \| Other Noncurrent Assets [Member] \| Interest Rate Cap [Member]
Derivatives, Fair Value [Line Items]
Interest Rate Cash Flow Hedge Asset at Fair Value	563	0
Not Designated as Hedging Instrument [Member] \| Other Current Assets [Member]
Asset Derivatives [Abstract]
Foreign exchange forward contracts	169	27
Not Designated as Hedging Instrument [Member] \| Other Current Assets [Member] \| Interest Rate Cap [Member]
Derivatives, Fair Value [Line Items]
Interest Rate Cash Flow Hedge Asset at Fair Value	4	0
Not Designated as Hedging Instrument [Member] \| Other Current Liabilities [Member]
Liability Derivatives [Abstract]
Foreign exchange forward contracts	$ 449	$ 99

Fair value, after the 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 not subject to a master netting arrangement and not elected to be offset.

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-Name Accounting Standards Codification
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Publisher FASB
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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 all interest rate derivative assets designated as cash flow hedging instruments.

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