Benefit Plans Amortization (Details) $ in Thousands	12 Months Ended
Dec. 31, 2015 USD ($)
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost	$ 3,440
Amortization of loss	376
Total	3,816
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost	197
Amortization of loss	188
Total	$ 385

Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation).

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration