Fair Value Disclosure (On a Recurring Basis) (Details) (Fair value measurements, recurring, USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Total
Assets:
Available for sale securities	$ 6,906	$ 6,540	$ 5,869
Interest rate swap agreements	278	937	764
Foreign currency exchange contracts		83	326
Assets at fair value	7,184	7,560	6,959
Liabilities:
Interest rate swap agreements	602
Foreign currency exchange contracts	393	14
Contingent consideration	1,597	1,581	1,564
Liabilities at fair value	2,592	1,595	1,564
Level 1
Assets:
Available for sale securities	6,906	6,540	5,869
Interest rate swap agreements	0	0	0
Foreign currency exchange contracts		0	0
Assets at fair value	6,906	6,540	5,869
Liabilities:
Interest rate swap agreements	0
Foreign currency exchange contracts	0	0
Contingent consideration	0	0	0
Liabilities at fair value	0	0	0
Level 2
Assets:
Available for sale securities	0	0	0
Interest rate swap agreements	278	937	764
Foreign currency exchange contracts		83	326
Assets at fair value	278	1,020	1,090
Liabilities:
Interest rate swap agreements	602
Foreign currency exchange contracts	393	14
Contingent consideration	0	0	0
Liabilities at fair value	995	14	0
Level 3
Assets:
Available for sale securities	0	0	0
Interest rate swap agreements	0	0	0
Foreign currency exchange contracts		0	0
Assets at fair value	0	0	0
Liabilities:
Interest rate swap agreements	0
Foreign currency exchange contracts	0	0
Contingent consideration	1,597	1,581	1,564
Liabilities at fair value	$ 1,597	$ 1,581	$ 1,564