Income Taxes (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Deferred tax liabilities:
Deferred sales commissions	$ (4,285,000)	$ (6,928,000)
Property and equipment	(10,335,000)	(6,706,000)
Benefit plans	(11,452,000)	(10,620,000)
Identifiable intangible assets	(12,562,000)	(16,697,000)
Unrealized gains on investment securities		(1,853,000)
Prepaid expenses	(2,150,000)	(2,100,000)
Total gross deferred liabilities	(40,784,000)	(44,904,000)
Deferred tax assets:
Accrued compensation	9,098,000	10,893,000
Additional pension and postretirement liability	28,389,000	11,663,000
Other accrued expenses	5,789,000	5,151,000
Unrealized losses on investment securities	673,000	962,000
Unrealized losses on investments in partnerships	370,000	2,031,000
Capital loss carryforwards	6,849,000	9,474,000
Nonvested stock	20,300,000	21,860,000
Unused state tax credits	992,000	866,000
State net operating loss carryforwards	5,718,000	6,521,000
Other	3,572,000	3,962,000
Valuation allowance
Valuation allowance	(13,476,000)	(16,986,000)
Decrease in valuation allowance related to realized capital gains on securities in investment portfolios and capital gain distributions from investments	1,500,000
Decrease in valuation allowance related to reduction in the tax loss on the sale of Legend	600,000
Reduction in valuation allowance due to realized capital gains on securities and appreciation in fair value of investment portfolios	200,000
Total gross deferred assets	81,750,000	73,383,000
Net deferred tax asset	27,490,000	11,493,000
State tax credit carryforwards that will expire between 2024 and 2030 if not utilized	800,000
State tax credit carryforwards that will expire in 2026 if not utilized	200,000
Capital loss carryforward
Valuation allowance
Valuation allowance	(7,900,000)	(10,600,000)
Decrease in valuation allowance related to realized capital gains on securities in investment portfolios and capital gain distributions from investments	4,200,000
Increase in valuation allowance related to losses from partnership investments	300,000
Reduction in valuation allowance due to realized capital gains on securities and appreciation in fair value of investment portfolios	2,300,000
Net operating loss carryforwards
Valuation allowance
Valuation allowance	$ (5,600,000)	$ (6,400,000)