Derivative Financial Instruments Fair Value of the Company's Derivative Instruments (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Designated as hedging instrument [Member] | Interest rate swap agreements [Member]
Derivative Fair Value [Line Items]
Fair value of derivative liabilities	$ 2,969,000	$ 2,439,000
Designated as hedging instrument [Member] | Interest rate swap agreements [Member] | Other assets, net [Member]
Derivative Fair Value [Line Items]
Fair value of derivative asset	12,728,000	36,987,000
Designated as hedging instrument [Member] | Interest rate swap agreements [Member] | Accrued expenses [Member]
Derivative Fair Value [Line Items]
Fair value of derivative liabilities	2,969,000	1,601,000
Designated as hedging instrument [Member] | Interest rate swap agreements [Member] | Other long-term liabilities [Member]
Derivative Fair Value [Line Items]
Fair value of derivative liabilities	0	838,000
Not designated as hedging instrument [Member] | Cross-currency swap agreements [Member] | Prepaid expenses and other [Member]
Derivative Fair Value [Line Items]
Fair value of derivative asset	$ 0	$ 16,056,000