Retirement Plan (Narrative) (Details) (USD $)	12 Months Ended									3 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Defined Benefit Post-retirement Health Coverage [Member]	Dec. 31, 2013 401(K) Plans [Member]	Dec. 31, 2012 401(K) Plans [Member]	Dec. 31, 2011 401(K) Plans [Member]	Dec. 31, 2013 Pension Plan, Defined Benefit [Member]	Dec. 31, 2012 Pension Plan, Defined Benefit [Member]	Dec. 31, 2013 Defined Contribution Pension [Member]	Mar. 31, 2012 Defined Contribution Pension [Member]	Dec. 31, 2013 Defined Benefit Post-retirement Health Coverage [Member]	Dec. 31, 2012 Defined Benefit Post-retirement Health Coverage [Member]	Dec. 31, 2011 Defined Benefit Post-retirement Health Coverage [Member]	Dec. 31, 2013 Retirement Restoration Plan [Member]	Dec. 31, 2012 Retirement Restoration Plan [Member]	Dec. 31, 2011 Retirement Restoration Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Contributions	$ 22,700,000
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements	(39,500,000)											(1,726,000)	0	0
Projected benefit obligation, adjustment	(37,593,000)	(51,391,000)	3,586,000
Pension expense					15,500,000	16,000,000	9,700,000								400,000	300,000	600,000
Accrued pension liability								0	(17,728,000)			(15,715,000)	(26,797,000)
Expected long-term rate of return on assets	0.25%	6.50%	8.00%
Defined benefit plan, period for expected future benefit payments on frozen plan	3 years
Amendments										12,500,000	15,600,000	820,000	49,399,000
Accrued liability															6,800,000	7,400,000
Projected benefit obligations under this plan															6,800,000
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months												1,400,000			2,300,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Two												1,200,000			500,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Three												1,200,000			500,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Four												1,200,000			1,600,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Five												1,300,000			300,000
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter												6,600,000			1,300,000
Post-retirement Healthcare Plans, elimination of benefits, age	65 years
Post-retirement Healthcare Plans, elimination of early retirement benefits, age				62 years
Post-retirement Healthcare Plans, requirement for cash payment in lieu of benefits, age				65 years
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax				$ 1,700,000