Pension and Other Postretirement Plans (Defined Contribution Pension Plans) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Additional company's matching contribution	3.00%
Non-Qualified Contribution Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total company contribution, non-qualified deferred compensation	$ 99	$ 140	$ 66
401K Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total company contribution, 401(k) plan	$ 491	$ 410	$ 323
Company's employee annual contribution percentage for 401K	3.00%