Employee Benefit Plans (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 856,000	$ 838,000
Expected return on plan assets, net of expenses	(1,150,000)	(1,088,000)
Amortization of net (gain)/loss	244,000	825,000
Total for defined benefit plans	(50,000)	575,000
Supplemental executive retirement plan ("SERP")	945,000	1,069,000
Defined contribution plans	6,586,000	6,336,000
Total	7,481,000	7,980,000
Employer contributions to SERP	200,000
Company contributions	0
Expected contributions to SERP	2,500,000
Assets Held-in-trust, Current	19,000,000
Life Settlement Contracts, Investment Method, Face Value	12,800,000
Cash Surrender Value of Life Insurance	13,900,000		13,800,000
Deferred compensation	41,500,000		38,900,000
SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of actuarial losses	$ 500,000	$ 700,000