Derivative Financial Instruments Fair Value of the Company's Derivative Instruments (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Designated as hedging instrument [Member] | Interest rate swap [Member] | Accrued expenses [Member]
Derivative Fair Value [Line Items]
Fair value of derivative liabilities	$ 2,781,000	$ 1,601,000
Designated as hedging instrument [Member] | Interest rate swap [Member] | Other long-term liabilities [Member]
Derivative Fair Value [Line Items]
Fair value of derivative liabilities	724,000	838,000
Fair Value, Inputs, Level 2 [Member]
Derivative Fair Value [Line Items]
Fair value of derivative asset	15,686,000	53,043,000
Fair value of derivative liabilities	3,505,000	2,439,000
Fair Value, Inputs, Level 2 [Member] | Designated as hedging instrument [Member] | Interest rate swap [Member]
Derivative Fair Value [Line Items]
Fair value of derivative liabilities	3,505,000	2,439,000
Fair Value, Inputs, Level 2 [Member] | Designated as hedging instrument [Member] | Interest rate swap [Member] | Other assets, net [Member]
Derivative Fair Value [Line Items]
Fair value of derivative asset	15,686,000	36,987,000
Fair Value, Inputs, Level 2 [Member] | Not designated as hedging instrument [Member] | Cross-currency swap [Member] | Prepaid expenses and other [Member]
Derivative Fair Value [Line Items]
Fair value of derivative asset	$ 0	$ 16,056,000