Derivative Financial Instruments Derivative and Nonderivative Hedging Instrument Fair Value Disclosure (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Liability Derivatives [Abstract]
Total liability derivatives	$ 2,176	$ 2,839
Other Current Assets [Member]
Asset Derivatives [Abstract]
Foreign exchange forward contracts	41	146
Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Liability Derivatives [Abstract]
Interest rate swap contracts	1,557	629
Designated as Hedging Instrument [Member] | Other Long Term Obligations [Member]
Liability Derivatives [Abstract]
Interest rate swap contracts	474	2,096
Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Liability Derivatives [Abstract]
Foreign exchange forward contracts	$ 145	$ 114