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Employee Pension Plans (Details) (Pension Plans, Defined Benefit [Member], USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Pension Plans, Defined Benefit [Member]
        
Net periodic benefit cost by component [Abstract]        
Interest cost $ 1,005,000 $ 1,108,000 $ 2,010,000 $ 2,216,000
Expected return on plan assets (1,186,000) (1,254,000) (2,372,000) (2,509,000)
Amortization of net loss 1,396,000 992,000 2,793,000 1,984,000
Net periodic benefit cost 1,215,000 846,000 2,431,000 1,691,000
Contributions to the defined benefit pension plan     1,700,000 1,400,000
Expected contributions to the defined benefit pension plan in remainder of current fiscal year $ 2,200,000   $ 2,200,000