Pension (Plan Asset Allocation, Fair Value) (Details) - Defined Benefit Pension Plan - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 316,184	$ 414,361	$ 403,249
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	267,326	355,829
Level Three
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	48,858	58,532	$ 60,231
Cash & Cash Equivalents | Level One
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Cash & Cash Equivalents | Level Two
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9,558	10,327
Cash & Cash Equivalents | Level Three
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
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	17,376	17,332
Real Estate | Level Three
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	4,224
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	138,497	170,324
Equity Securities | Level Three
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
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	101,895	157,846
Debt Securities | Level Three
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
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	48,858	54,308
Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	316,184	414,361
Total | Cash & Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9,558	10,327
Total | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17,376	21,556
Total | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	138,497	170,324
Total | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	101,895	157,846
Total | Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 48,858	$ 54,308