Business Combinations - Allocation of the Purchase Price of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Assets
Goodwill	$ 170,914	$ 176,031
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Assets
Cash	6,787	6,787
Accounts Receivable	2,602	2,602
Furniture, Equipment and Leasehold Improvements, Net	283	283
Other Assets	2,834	2,915
Identifiable Intangible Assets	40,600	40,600
Goodwill	98,628	103,745
Deferred Tax Asset	111	111
Total Assets	151,845	157,043
Other Assets	(81)
Goodwill	(5,117)
Total Assets	(5,198)
Liabilities
Accrued Compensation and Benefits	192	192
Accounts Payable, Accrued Expenses and Other Liabilities	8,660	8,660
Deferred Rent Liability	230	230
Taxes Payable	54	54
Deferred Revenue	6,560	6,560
Total Liabilities	15,696	15,696
Net Assets	(5,198)
Net Assets	$ 136,149	$ 141,347