Contingent Consideration - Contingent Consideration (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Business Acquisition, Contingent Consideration [Line Items]
Fair Value Measurements Valuation Process Probability Percentage			100.00%
Business Combination, Contingent Consideration, Liability	$ 19,300,000		$ 19,300,000
Fair value of contingent consideration adjustment expense (income)	788,000	$ 701,000	9,975,423	$ 1,690,743
Business combination, contingent consideration, maximum potential cash payment	69,490,283		69,490,283
Eyelevel [Member]
Business Acquisition, Contingent Consideration [Line Items]
Fair value of contingent consideration adjustment expense (income)	1,300,000		9,400,000
Others [Member]
Business Acquisition, Contingent Consideration [Line Items]
Fair value of contingent consideration adjustment expense (income)	500,000		600,000
Minimum [Member] | Eyelevel [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business combination, contingent consideration, maximum potential cash payment	12,000,000		12,000,000
Cumulative EBITDA			30,000,000
Maximum [Member] | Eyelevel [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business combination, contingent consideration, maximum potential cash payment	$ 24,000,000		24,000,000
Cumulative EBITDA			$ 40,000,000