Derivative Financial Instruments Fair Value of Derivative Instrument (Details) - Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Financial assets carried at fair value	$ 1,530	$ 136
Interest rate swap [Member]
Derivatives, Fair Value [Line Items]
Financial liabilities carried at fair value	12,501	4,711
Interest rate swap [Member] \| Prepaid expenses and other [Member]
Derivatives, Fair Value [Line Items]
Financial assets carried at fair value	0	35
Interest rate swap [Member] \| Other assets, net [Member]
Derivatives, Fair Value [Line Items]
Financial assets carried at fair value	0	101
Interest rate swap [Member] \| Accrued expenses [Member]
Derivatives, Fair Value [Line Items]
Financial liabilities carried at fair value	846	2,249
Interest rate swap [Member] \| Other long-term liabilities [Member]
Derivatives, Fair Value [Line Items]
Financial liabilities carried at fair value	11,655	2,462
British pound forward contracts [Member] \| Other assets, net [Member]
Derivatives, Fair Value [Line Items]
Financial liabilities carried at fair value	$ 1,530	$ 0

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.

Reference 1: 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=51814546&loc=SL51823488-111719

Reference 2: 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 3: 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=56946850&loc=SL5624163-113959

Reference 4: 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=51825145&loc=SL20226000-175313

Name:	us-gaap_DerivativeFairValueOfDerivativeLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant