Income Taxes (Income Tax Reconciliation) (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Federal statutory rate	35.00%	35.00%	35.00%
Domestic statutory rate at 35%	$ 21,212,000	$ 17,985,000	$ 15,206,000
Increase (reduction) from:
Jurisdictional rate differences	(2,119,000)	(1,959,000)	(1,477,000)
Goodwill impairment	0	0	157,000
Valuation allowance	353,000	(114,000)	825,000
Stock based compensation	199,000	136,000	214,000
U.S. state taxes	1,649,000	1,496,000	589,000
Domestic production deduction	(1,321,000)	(1,162,000)	(948,000)
R&E credit	(614,000)	(856,000)	(130,000)
Other, net	95,000	(232,000)	107,000
Total income taxes	$ 19,454,000us-gaap_IncomeTaxExpenseBenefit	$ 15,294,000us-gaap_IncomeTaxExpenseBenefit	$ 14,543,000us-gaap_IncomeTaxExpenseBenefit
Effective tax rate	32.00%	30.00%	33.00%

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments.

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