Derivative Financial Instruments Fair Value of the Company's Derivative Instruments (Details) - Designated as Hedging Instrument [Member] - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 95,000	$ 136,000
Derivative Liability, Fair Value, Gross Liability	17,767,000	4,711,000
Interest rate swap agreements [Member] | Prepaid expenses and other [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	35,000
Interest rate swap agreements [Member] | Other assets, net [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	101,000
Interest rate swap agreements [Member] | Accrued expenses [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	1,899,000	2,249,000
Interest rate swap agreements [Member] | Other long-term liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	14,429,000	2,462,000
British pound forward purchase contracts [Member] | Other assets, net [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	95,000	0
British pound forward purchase contracts [Member] | Other long-term liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 1,439,000	$ 0