Employee Benefit Plans - Narrative (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($) entrant	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of new entrants after pension plans were frozen | entrant	0
Employer contributions to the pension plans	$ 0	$ 0
Minimum | Forecast
Defined Benefit Plan Disclosure [Line Items]
Settlement charges			$ (800,000)
Maximum | Forecast
Defined Benefit Plan Disclosure [Line Items]
Settlement charges			$ (1,700,000)
Other Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Net period benefit costs		100,000
Expected employer contributions for current year	200,000
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net period benefit costs	0	$ 0
Expected employer contributions for current year	$ 0