Related Party Transactions (Details)	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
NCC [Member]
Related Party Transaction [Line Items]
Equity Method Investment, Ownership Percentage	50.00%
Cash contribution for acquisition of membership interest	$ 1,121,000
Office space occupied (in square feet)	54,800
Monthly rent expense (per month)	$ 86,767
Related Party Rent expense	1,035,000	$ 1,016,000	$ 989,000
Other Leases [Member]
Related Party Transaction [Line Items]
Related Party Rent expense	$ 0	$ 0	$ 64,000