Income Taxes (Effective Income Tax Rate Reconciliation) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Income from continuing operations before tax and equity investment	$ 4,278,000	$ 14,004,000	$ 17,687,000	$ 2,180,000	$ 3,818,000	$ 7,331,000	$ 16,546,000	$ 7,519,000	$ 38,149,000	$ 35,214,000	$ 28,328,000
Tax provision at statutory rate									13,352,000	12,325,000	9,915,000
Foreign dividend income									0	0	929,000
State income tax, net of federal effect									2,455,000	2,396,000	919,000
Net increase (decrease) in valuation allowance									12,000	(454,000)	(116,689,000)
(Decrease) increase in liability for uncertain tax positions									(679,000)	8,000	43,000
Net effect of foreign tax rate and tax holidays									17,000	(942,000)	(369,000)
Other items, net									871,000	(268,000)	(836,000)
Total income tax provision (benefit)									16,028,000	13,065,000	(106,088,000)
Unrecognized tax benefits that would impact effective tax rate if recognized	$ 1,300,000				$ 2,300,000				$ 1,300,000	$ 2,300,000