Commitments and Contingencies (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Commitments and Contingencies (Details) [Line Items]
Leases Terms of Expiration	10 years
Operating Leases, Rent Expense	$ 3,000,000	$ 2,900,000
Letter of Credit [Member]
Commitments and Contingencies (Details) [Line Items]
Letters of Credit Outstanding, Amount	$ 663,000