Employee Benefit Plans Amounts Recognized Accumlated Other Comprehensive Income (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]
Prior year accumulated other comprehensive income	$ (26,216)	$ (37,828)
Amortization of prior service costs	0	0	(2,018)
Amortization of gain (loss)	1,015	2,099
Net (loss) gain arising during the year	(4,698)	9,513	1,463
Current year accumulated other comprehensive (loss) income	(29,899)	(26,216)	(37,828)
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior year accumulated other comprehensive income	(27,102)	(37,646)
Amortization of prior service costs	0	0
Amortization of gain (loss)	1,075	2,163
Net (loss) gain arising during the year	(4,454)	8,381
Current year accumulated other comprehensive (loss) income	(30,481)	(27,102)
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior year accumulated other comprehensive income	886	(182)
Amortization of prior service costs	0	0
Amortization of gain (loss)	(60)	(64)
Net (loss) gain arising during the year	(244)	1,132
Current year accumulated other comprehensive (loss) income	$ 582	$ 886