Leases (Schedule of Operating Leases Spaces) (Details) - ft²	12 Months Ended
	Dec. 31, 2018	Feb. 28, 2018
Corporate Headquarters [Member]
Operating Leased Assets [Line Items]
Square Footage (Approximate)		63,000
Corporate Headquarters [Member] | New York, NY [Member]
Operating Leased Assets [Line Items]
Square Footage (Approximate)	82,300
Expiration Date	Dec. 31, 2033
Office and Showroom [Member] | New York, NY [Member]
Operating Leased Assets [Line Items]
Square Footage (Approximate)	10,900
Expiration Date	Sep. 12, 2024
Other Rentable Space [Member]
Operating Leased Assets [Line Items]
Square Footage (Approximate)		7,000
Other Rentable Space [Member] | Los Angeles, CA [Member]
Operating Leased Assets [Line Items]
Square Footage (Approximate)	4,724
Expiration Date	Jul. 31, 2020