Retirement Plans Pension and Postretirement Plans Table (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Change in Fair Value of Plan Assets
Fair value of plan assets at beginning of year	$ 224,426
Employer Contributions	28,000	40,000
Fair value of plan assets at end of year	282,000	224,426
Pension Plans, Defined Benefit [Member]
Change in Fair Value of Plan Assets
Fair value of plan assets at beginning of year	224,426	173,422
Actual return on plan assets	42,400	20,781
Employer Contributions	28,000	40,000
Gross benefits paid	(12,826)	(9,777)
Fair value of plan assets at end of year	282,000	224,426	173,422
Change in Benefit Obligation
Net benefit obligation at beginning of year	159,748	136,846
Service cost	12,078	10,287	9,898
Interest cost	6,237	6,547	6,414
Curtailments, Settlements, Special Termination Benefits	0	42
Actuarial gain (loss)	(10,613)	15,803
Gross benefits paid	(12,826)	(9,777)
Net benefit obligation at end of year	154,624	159,748	136,846
Funded (unfunded) status	127,376	64,678
Noncurrent assets	127,376	67,878
Current liabilities	0	0
Noncurrent liabilities	0	(3,200)
Asset (Liability) Recognized in the Consolidated Balance Sheet	127,376	64,678
Other Postretirement Benefit Plans, Defined Benefit [Member]
Change in Fair Value of Plan Assets
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer Contributions	351	495
Gross benefits paid	(351)	(495)
Fair value of plan assets at end of year	0	0	0
Change in Benefit Obligation
Net benefit obligation at beginning of year	3,935	3,969
Service cost	0	0
Interest cost	142	182	198
Curtailments, Settlements, Special Termination Benefits	0	0
Actuarial gain (loss)	(438)	279
Gross benefits paid	(351)	(495)
Net benefit obligation at end of year	3,288	3,935	3,969
Funded (unfunded) status	(3,288)	(3,935)
Noncurrent assets	0	0
Current liabilities	(343)	(458)
Noncurrent liabilities	(2,945)	(3,477)
Asset (Liability) Recognized in the Consolidated Balance Sheet	$ (3,288)	$ (3,935)