Derivative and Nonderivative Hedging Instrument Fair Value Disclosure (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Asset Derivatives [Abstract]
Gross Amounts of Recognized Assets Presented in the Consolidated Balance Sheets	$ 7,401,000	$ 2,900,000
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	195,000	41,000
Not Designated as Hedging Instrument [Member] \| Other Current Liabilities [Member]
Liability Derivatives [Abstract]
Foreign exchange forward contracts	276,000	289,000
Interest Rate Swap [Member] \| Designated as Hedging Instrument [Member] \| Other Current Assets [Member]
Asset Derivatives [Abstract]
Interest Rate Derivative Assets, at Fair Value	1,710,000	658,000
Interest Rate Swap [Member] \| Designated as Hedging Instrument [Member] \| Other Noncurrent Assets [Member]
Asset Derivatives [Abstract]
Interest Rate Derivative Assets, at Fair Value	2,086,000	1,712,000
Interest Rate Cap [Member] \| Designated as Hedging Instrument [Member] \| Other Current Assets [Member]
Asset Derivatives [Abstract]
Interest Rate Derivative Assets, at Fair Value	396,000	17,000
Interest Rate Cap [Member] \| Designated as Hedging Instrument [Member] \| Other Noncurrent Assets [Member]
Asset Derivatives [Abstract]
Interest Rate Derivative Assets, at Fair Value	839,000	179,000
Interest Rate Cap [Member] \| Not Designated as Hedging Instrument [Member] \| Other Current Assets [Member]
Asset Derivatives [Abstract]
Interest Rate Derivative Assets, at Fair Value	0	25,000
Interest Rate Cap [Member] \| Not Designated as Hedging Instrument [Member] \| Other Noncurrent Assets [Member]
Asset Derivatives [Abstract]
Interest Rate Derivative Assets, at Fair Value	0	268,000
Currency Swap [Member] \| Designated as Hedging Instrument [Member] \| Other Current Assets [Member]
Asset Derivatives [Abstract]
Foreign Currency Fair Value Hedge Asset at Fair Value	1,523,000	0
Currency Swap [Member] \| Designated as Hedging Instrument [Member] \| Other Noncurrent Assets [Member]
Asset Derivatives [Abstract]
Foreign Currency Fair Value Hedge Asset at Fair Value	$ 652,000	$ 0

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

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- Definition

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

+ References

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Fair value as of the balance sheet date of all derivative assets designated as foreign currency fair value hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

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