Fair Value Disclosure (On a Recurring Basis) (Details) - Fair value measurements, recurring - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Level 1
Assets:
Available for sale securities	$ 7,498	$ 7,247	$ 7,256
Interest rate swap agreements		0	0
Foreign currency exchange contracts		0	0
Assets at fair value	7,498	7,247	7,256
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	30
Foreign currency exchange contracts		386	240
Assets at fair value	0	389	270
Liabilities:
Interest rate swap agreements	2,491	698	951
Foreign currency exchange contracts	295
Liabilities at fair value	2,786	698	951
Level 3
Assets:
Available for sale securities	0	0	0
Interest rate swap agreements		0	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	7,498	7,247	7,256
Interest rate swap agreements		3	30
Foreign currency exchange contracts		386	240
Assets at fair value	7,498	7,636	7,526
Liabilities:
Interest rate swap agreements	2,491	698	951
Foreign currency exchange contracts	295
Liabilities at fair value	$ 2,786	$ 698	$ 951