Income Taxes (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Deferred tax liabilities:
Deferred sales commissions	$ (7,405,000)	$ (7,861,000)
Property and equipment	(8,010,000)	(13,017,000)
Benefit plans	(9,723,000)	(9,617,000)
Identifiable intangible assets	(8,583,000)	(8,523,000)
Unrealized gains on investment securities	(1,084,000)
Purchase of fund assets	(7,458,000)	(6,631,000)
Prepaid expenses	(2,138,000)	(2,430,000)
Total gross deferred liabilities	(44,401,000)	(48,079,000)
Deferred tax assets:
Acquisition lease liability	953,000	1,108,000
Additional pension and postretirement liability	28,935,000	26,403,000
Accrued expenses	12,705,000	13,285,000
Unrealized losses on investment securities	843,000	2,318,000
Unrealized losses on investments in partnerships	789,000	196,000
Capital loss carryforwards	169,000	3,022,000
Excess tax basis on investment in subsidiary	17,921,000
Nonvested stock	21,070,000	19,051,000
Unused state tax credits	972,000	1,123,000
State net operating loss carryforwards	6,284,000	5,893,000
Other	4,230,000	3,817,000
Total gross deferred assets	94,871,000	76,216,000
Net deferred tax asset	25,775,000	16,946,000
Other net deferred tax assets being capital in nature	500,000
Other net deferred tax liabilities being capital in nature		2,500,000
State tax credit carryforwards that will expire between 2024 and 2028 if not utilized	700,000
State tax credit carryforwards that will expire in 2026 if not utilized		300,000
Valuation allowance
Valuation allowance	(24,695,000)	(11,191,000)
Decrease in the valuation allowance recorded as an increase to accumulated other comprehensive loss	2,024,000	(2,955,000)	963,000
Capital loss carryforward
Valuation allowance
Valuation allowance	(18,600,000)	(5,500,000)
Increase in valuation allowance related to non-cash impairment charge to Legend	17,900,000
Increase in valuation allowance related to losses from partnership investments	600,000
Reduction in valuation allowance due to realized capital gains on securities and appreciation in fair value of investment portfolios	3,400,000
Decrease in the valuation allowance recorded as an increase to accumulated other comprehensive loss	2,000,000
Net operating loss carryforwards
Valuation allowance
Valuation allowance	$ (6,100,000)	$ (5,700,000)