Income Taxes (Effective Income Tax Rate Reconciliation) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income from continuing operations before tax and equity investment	$ 2,610,000	$ 17,515,000	$ 15,299,000	$ 3,878,000	$ 1,135,000	$ 12,318,000	$ 14,870,000	$ (827,000)	$ 39,302,000	$ 27,496,000	$ 23,861,000
Tax provision at statutory rate									13,755,000	9,624,000	8,351,000
State income tax, net of federal effect									1,991,000	2,131,000	2,173,000
Net (decrease) increase in valuation allowance									(12,000)	12,000	(454,000)
(Decrease) increase in liability for uncertain tax positions									(70,000)	(679,000)	8,000
Foreign tax differential, principally foreign losses for which tax benefit is not available									600,000	192,000	(123,000)
Other items, net									744,000	881,000	(318,000)
Total income tax provision									17,008,000	12,161,000	9,637,000
Unrecognized tax benefits that would impact effective tax rate if recognized	$ 1,300,000								$ 1,300,000