Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

On July 1, 2018, the Company entered into a new lease agreement for office space at its headquarters at 55 East 52nd St., New York, New York. Under the terms of the agreement, the Company committed to extend the lease term for its current space and add space on up to seven additional floors, three of which commence as of the lease’s effective date. The Company anticipates it will take possession of the remainder of these floors over the next five years. When all floors have commenced, the Company will have approximately 350,000 square feet of space at this location. The lease term for all current and prospective space will end on June 30, 2034. The Company anticipates that the approximate aggregate additional minimum future payments under this arrangement, net of rent abatement and certain other rent credits, will be as follows:

2018	$	31
2019	629
2020	6,240
2021	11,671
2022	16,641
Thereafter	402,976
Total	$	438,188

Restrictions on Cash and Cash Equivalents

Restricted Cash – The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the statements of financial position that sum to the total of amounts shown in the Unaudited Condensed Consolidated Statements of Cash Flows:

	June 30,
	2018		2017
Cash and Cash Equivalents	$	403,929	$	410,212
Restricted Cash included in Other Assets	11,072		17,752
Total Cash, Cash Equivalents and Restricted Cash shown in the Statement of Cash Flows	$	415,001	$	427,964