Pension (Plan Asset Allocation, Fair Value) (Details) (Defined Benefit Pension Plans and SERP, USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 382,266	$ 274,029	$ 257,969
Level One
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level Two
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	328,410	235,068
Level Three
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	53,856	38,961	35,989
Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	382,266	274,029
Cash and Cash Equivalents | Level One
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Cash and Cash Equivalents | Level Two
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	781	3,550
Cash and Cash Equivalents | Level Three
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Cash and Cash Equivalents | Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	781	3,550
Real Estate | Level One
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Real Estate | Level Two
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	15,613	11,163
Real Estate | Level Three
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,305	5,982
Real Estate | Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	21,918	17,145
Equity Securities | Level One
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Equity Securities | Level Two
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	149,902	113,400
Equity Securities | Level Three
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Equity Securities | Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	149,902	113,400
Debt Securities | Level One
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Debt Securities | Level Two
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	162,114	106,955
Debt Securities | Level Three
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Debt Securities | Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	162,114	106,955
Hedge Funds | Level One
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Hedge Funds | Level Two
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Hedge Funds | Level Three
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	47,551	32,979
Hedge Funds | Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 47,551	$ 32,979