Employee Benefit Plans - AOCI Amortization in Next Fiscal Year (Details) $ in Thousands	12 Months Ended
Dec. 31, 2016 USD ($)
Pension
Defined Benefit Plan Disclosure [Line Items]
Amortization of loss (gain)	$ 416
Postretirement
Defined Benefit Plan Disclosure [Line Items]
Amortization of loss (gain)	$ (1)

Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) 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.

No definition available.

Name:	us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration