Fair Value of Financial Instruments Financial Instruments Carried at Fair Value (Details) (Fair Value, Inputs, Level 2 [Member], USD $)	Sep. 30, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets carried at fair value	$ 12,728,000	$ 53,043,000
Financial liabilities carried at fair value	2,969,000	2,439,000
Interest rate swap agreements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets carried at fair value	12,728,000	36,987,000
Financial liabilities carried at fair value	2,969,000	2,439,000
Cross-currency swap agreements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets carried at fair value	$ 0	$ 16,056,000