Income Taxes (Income Tax Reconciliation) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Domestic statutory rate at 35% (34% for 2011 and 2010)	$ 17,985,000	$ 15,206,000	$ 16,364,000
Increase (reduction) from:
Jurisdictional rate differences	(1,959,000)	(1,477,000)	(1,315,000)
Goodwill impairment	0	157,000	633,000
Valuation allowance	(114,000)	825,000	0
Stock based compensation	136,000	214,000	161,000
U.S. state taxes	1,496,000	589,000	740,000
Domestic Production Deduction	(1,162,000)	(948,000)	(796,000)
R&E Credit Reserve	(856,000)	(130,000)	(252,000)
Other, net	(232,000)	107,000	(93,000)
Total income taxes	$ 15,294,000	$ 14,543,000	$ 15,442,000
Effective tax rate	30.00%	33.00%	32.00%
Federal statutory rate	35.00%	35.00%	34.00%