Fair Value of Financial Instruments and Concentration of Credit Risk (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Other Liabilities [Member] | Level 1 | Interest rate hedge agreements [Member]
Summary of derivatives held by the company
Assets (Liabilities) Measured at Fair Value	$ 0	$ 0
Other Liabilities [Member] | Level 2 | Interest rate hedge agreements [Member]
Summary of derivatives held by the company
Assets (Liabilities) Measured at Fair Value	(1,129)	(1,400)
Other Liabilities [Member] | Level 3 | Interest rate hedge agreements [Member]
Summary of derivatives held by the company
Assets (Liabilities) Measured at Fair Value	0	0
Accrued Liabilities [Member] | Level 1 | Interest rate hedge agreements [Member]
Summary of derivatives held by the company
Assets (Liabilities) Measured at Fair Value	0	0
Accrued Liabilities [Member] | Level 1 | Foreign currency hedge agreements
Summary of derivatives held by the company
Assets (Liabilities) Measured at Fair Value	0	0
Accrued Liabilities [Member] | Level 2 | Interest rate hedge agreements [Member]
Summary of derivatives held by the company
Assets (Liabilities) Measured at Fair Value	(1,515)	(1,509)
Accrued Liabilities [Member] | Level 2 | Foreign currency hedge agreements
Summary of derivatives held by the company
Assets (Liabilities) Measured at Fair Value	(836)	(571)
Accrued Liabilities [Member] | Level 3 | Interest rate hedge agreements [Member]
Summary of derivatives held by the company
Assets (Liabilities) Measured at Fair Value	0	0
Accrued Liabilities [Member] | Level 3 | Foreign currency hedge agreements
Summary of derivatives held by the company
Assets (Liabilities) Measured at Fair Value	0	0
Other Assets [Member] | Level 1 | Foreign currency hedge agreements
Summary of derivatives held by the company
Assets (Liabilities) Measured at Fair Value	0
Other Assets [Member] | Level 2 | Foreign currency hedge agreements
Summary of derivatives held by the company
Assets (Liabilities) Measured at Fair Value	7
Other Assets [Member] | Level 3 | Foreign currency hedge agreements
Summary of derivatives held by the company
Assets (Liabilities) Measured at Fair Value	$ 0