Equity - Treasury Stock (Details) - USD ($)	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015	Dec. 31, 2014	May 12, 2014
Equity [Abstract]
Authorized share amount for repurchase (up to)		$ 60,000,000	$ 20,000,000	$ 10,000,000
Stock repurchase (in shares)	1,338,616
Shares repurchased, value	$ 10,338,000
Brokerage commissions	40,000
Remaining authorizations under the repurchase program	$ 3,936,000
Shares reissued from the treasury (in shares)	2,854,189
Shares reissued from the treasury, value	$ 23,257,728