Commitments and Contingencies (Details) - USD ($)	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Other Commitments [Line Items]
Loss Contingency Accrual	$ 0	$ 0
Maximum [Member]
Other Commitments [Line Items]
Loss expected to be recognized upon termination of pension plan	8,000,000
Maximum [Member] | Cash [Member]
Other Commitments [Line Items]
Loss expected to be recognized upon termination of pension plan	$ 2,000,000