Fair Value Information and Derivative Financial Instruments (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Financial Assets
Assets Fair Value Disclosure	$ 3,852
Financial Liabilities
Liabilities Fair Value Disclosure	396
Directors' deferred compensation liability [Member]
Financial Liabilities
Liabilities Fair Value Disclosure	396
Directors' deferred compensation investments [Member]
Financial Assets
Assets Fair Value Disclosure	396
Foreign Currency Forward Contract [Member]
Financial Assets
Assets Fair Value Disclosure	3,456
Fair Value, Inputs, Level 1 [Member]
Financial Assets
Assets Fair Value Disclosure	396
Financial Liabilities
Liabilities Fair Value Disclosure	396
Fair Value, Inputs, Level 1 [Member] | Directors' deferred compensation liability [Member]
Financial Liabilities
Liabilities Fair Value Disclosure	396
Fair Value, Inputs, Level 1 [Member] | Directors' deferred compensation investments [Member]
Financial Assets
Assets Fair Value Disclosure	396
Fair Value, Inputs, Level 1 [Member] | Foreign Currency Forward Contract [Member]
Financial Assets
Assets Fair Value Disclosure	0
Fair Value, Inputs, Level 2 [Member]
Financial Assets
Assets Fair Value Disclosure	3,456
Financial Liabilities
Liabilities Fair Value Disclosure	0
Fair Value, Inputs, Level 2 [Member] | Directors' deferred compensation liability [Member]
Financial Liabilities
Liabilities Fair Value Disclosure	0
Fair Value, Inputs, Level 2 [Member] | Directors' deferred compensation investments [Member]
Financial Assets
Assets Fair Value Disclosure	0
Fair Value, Inputs, Level 2 [Member] | Foreign Currency Forward Contract [Member]
Financial Assets
Assets Fair Value Disclosure	3,456
Fair Value, Inputs, Level 3 [Member]
Financial Assets
Assets Fair Value Disclosure	0
Financial Liabilities
Liabilities Fair Value Disclosure	0
Fair Value, Inputs, Level 3 [Member] | Directors' deferred compensation liability [Member]
Financial Liabilities
Liabilities Fair Value Disclosure	0
Fair Value, Inputs, Level 3 [Member] | Directors' deferred compensation investments [Member]
Financial Assets
Assets Fair Value Disclosure	0
Fair Value, Inputs, Level 3 [Member] | Foreign Currency Forward Contract [Member]
Financial Assets
Assets Fair Value Disclosure	$ 0