Derivative Financial Instruments Fair Value of the Company's Derivative Instruments (Details) (Designated as hedging instrument [Member], USD $)	Mar. 31, 2015	Dec. 31, 2014
Derivative Fair Value [Line Items]
Fair value of derivative asset	$ 0	$ 136,000
Fair value of derivative liabilities	15,094,000	4,711,000
Interest rate swap agreements [Member] \| Prepaid Expenses and Other Current Assets [Member]
Derivative Fair Value [Line Items]
Fair value of derivative asset	0	35,000
Interest rate swap agreements [Member] \| Other assets, net [Member]
Derivative Fair Value [Line Items]
Fair value of derivative asset	0	101,000
Interest rate swap agreements [Member] \| Accrued expenses [Member]
Derivative Fair Value [Line Items]
Fair value of derivative liabilities	2,159,000	2,249,000
Interest rate swap agreements [Member] \| Other long-term liabilities [Member]
Derivative Fair Value [Line Items]
Fair value of derivative liabilities	12,148,000	2,462,000
British pound forward purchase contracts [Member] \| Other long-term liabilities [Member]
Derivative Fair Value [Line Items]
Fair value of derivative liabilities	$ 787,000	$ 0

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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