Segment Revenues (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Total Revenues	$ 31,130,000	$ 34,731,000	$ 39,751,000	$ 31,709,000	$ 30,171,000	$ 33,785,000	$ 38,849,000	$ 27,745,000	$ 137,321,395	$ 130,550,349
United States
Total Revenues									120,993,000	115,407,000
Canada
Total Revenues									7,040,000	6,935,000
Europe
Total Revenues									9,288,000	8,208,000
Other International
Total Revenues									1,420,000	1,176,000
Total International
Total Revenues									$ 17,748,000	$ 16,319,000