Fair Value Disclosure (On a Recurring Basis) (Details) - Fair value measurements, recurring - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Level 1
Assets:
Available for sale securities	$ 7,347	$ 7,247	$ 7,279
Interest rate swap agreements		0
Foreign currency exchange contracts		0	0
Assets at fair value	7,347	7,247	7,279
Liabilities:
Interest rate swap agreements	0	0	0
Foreign currency exchange contracts	0
Liabilities at fair value	0	0	0
Level 2
Assets:
Available for sale securities	0	0	0
Interest rate swap agreements		3
Foreign currency exchange contracts		386	634
Assets at fair value	0	389	634
Liabilities:
Interest rate swap agreements	1,850	698	1,242
Foreign currency exchange contracts	491
Liabilities at fair value	2,341	698	1,242
Level 3
Assets:
Available for sale securities	0	0	0
Interest rate swap agreements		0
Foreign currency exchange contracts		0	0
Assets at fair value	0	0	0
Liabilities:
Interest rate swap agreements	0	0	0
Foreign currency exchange contracts	0
Liabilities at fair value	0	0	0
Total
Assets:
Available for sale securities	7,347	7,247	7,279
Interest rate swap agreements		3
Foreign currency exchange contracts		386	634
Assets at fair value	7,347	7,636	7,913
Liabilities:
Interest rate swap agreements	1,850	698	1,242
Foreign currency exchange contracts	491
Liabilities at fair value	$ 2,341	$ 698	$ 1,242