Fair Value Disclosure (On a Recurring Basis) (Details) (Fair value measurements, recurring, USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Level 1
Assets:
Available for sale securities	$ 7,279	$ 7,220	$ 6,638
Interest rate swap agreements		0	0
Foreign currency exchange contracts	0	0	0
Assets at fair value	7,279	7,220	6,638
Liabilities:
Interest rate swap agreements	0
Foreign currency exchange contracts			0
Contingent consideration		0	0
Liabilities at fair value	0	0	0
Level 2
Assets:
Available for sale securities	0	0	0
Interest rate swap agreements		181	594
Foreign currency exchange contracts	634	292	125
Assets at fair value	634	473	719
Liabilities:
Interest rate swap agreements	1,242
Foreign currency exchange contracts			46
Contingent consideration		412	0
Liabilities at fair value	1,242	412	46
Level 3
Assets:
Available for sale securities	0	0	0
Interest rate swap agreements		0	0
Foreign currency exchange contracts	0	0	0
Assets at fair value	0	0	0
Liabilities:
Interest rate swap agreements	0
Foreign currency exchange contracts			0
Contingent consideration		0	1,589
Liabilities at fair value	0	0	1,589
Total
Assets:
Available for sale securities	7,279	7,220	6,638
Interest rate swap agreements		181	594
Foreign currency exchange contracts	634	292	125
Assets at fair value	7,913	7,693	7,357
Liabilities:
Interest rate swap agreements	1,242
Foreign currency exchange contracts			46
Contingent consideration		412	1,589
Liabilities at fair value	$ 1,242	$ 412	$ 1,635