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Post Retirement Benefits (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended		12 Months Ended
	Aug. 19, 2010	Dec. 31, 2013 Plan	Dec. 31, 2014 Postretirement benefits	Dec. 31, 2013 Postretirement benefits	Dec. 31, 2012 Postretirement benefits	Dec. 31, 2010 Postretirement benefits
Postretirement benefits:
Number of 401k plans		3
Payments for post retirement benefits	$ 1,257
Decrease in post retirement obligations						10,282
Amortization period						20 years
Change in net periodic benefit cost due to plan amendment			496	496
Actuarial gain (loss)				(2,917)	(792)
Prior service credit not yet recognized				7,109	4,487
Amounts that will be amortized from accumulated other comprehensive income in necxt fiscal year:
Amortization of prior service credit			496
Amortization of loss			47
Amortization of interest expense			277
Amounts that will be amortized in next fiscal year			172
Assumed health care cost trend rates:
Health care cost trend rate assumed for next fiscal year				7.00%	7.00%
Ultimate health care cost trend rate				5.00%	5.00%
Effect of changing the health care cost trend rate by one-percentage point for each future year:
Effect on total of service and interest cost components, 1 - percentage point increase				36
Effect on total of service and interest cost components, 1 - percentage point decrease				(50)
Effect on post retirement benefit obligation, 1 - percentage point increase				504
Effect on post retirement benefit obligation, 1 - percentage point decrease				$ (826)

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Number of 401k Plans

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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Disclosure under FAS 132R, before it was amended by FAS 158, of the portion of prior service costs and credits, due to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

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Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

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The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

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The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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