Derivative Financial Instruments - Derivative and Nonderivative Hedging Instrument Fair Value Disclosure (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Asset Derivatives [Abstract]
Total asset derivatives	$ 6,525,000	$ 2,900,000
Designated as Hedging Instrument [Member] \| Other Current Assets [Member] \| Interest Rate Swap [Member]
Asset Derivatives [Abstract]
Interest rate swap contracts	1,866,000	658,000
Designated as Hedging Instrument [Member] \| Other Current Assets [Member] \| Interest Rate Cap [Member]
Asset Derivatives [Abstract]
Interest rate cap contracts	535,000	17,000
Designated as Hedging Instrument [Member] \| Other Current Assets [Member] \| Currency Swap [Member]
Asset Derivatives [Abstract]
Cross currency swap contract	1,631,000	0
Designated as Hedging Instrument [Member] \| Other Noncurrent Assets [Member] \| Interest Rate Swap [Member]
Asset Derivatives [Abstract]
Interest rate cap contracts	746,000	1,712,000
Designated as Hedging Instrument [Member] \| Other Noncurrent Assets [Member] \| Interest Rate Cap [Member]
Asset Derivatives [Abstract]
Interest rate cap contracts	251,000	179,000
Designated as Hedging Instrument [Member] \| Other Noncurrent Assets [Member] \| Currency Swap [Member]
Asset Derivatives [Abstract]
Cross currency swap contract	1,339,000	0
Not Designated as Hedging Instrument [Member] \| Other Current Assets [Member]
Asset Derivatives [Abstract]
Foreign exchange forward contracts	157,000	41,000
Not Designated as Hedging Instrument [Member] \| Other Current Assets [Member] \| Interest Rate Cap [Member]
Asset Derivatives [Abstract]
Interest rate cap contracts	0	25,000
Not Designated as Hedging Instrument [Member] \| Other Noncurrent Assets [Member] \| Interest Rate Cap [Member]
Asset Derivatives [Abstract]
Interest rate cap contracts	0	268,000
Not Designated as Hedging Instrument [Member] \| Other Current Liabilities [Member]
Liability Derivatives [Abstract]
Foreign exchange forward contracts	$ 337,000	$ 289,000

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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
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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 derivative assets designated as foreign currency fair value 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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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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