Divestiture of Assets Held for Sale (Details) (USD $)	0 Months Ended	3 Months Ended	6 Months Ended
	Jun. 28, 2013	Jun. 30, 2013	Jun. 30, 2013
Less:
Net gain on transaction		$ 22,725,000	$ 22,725,000
Building at West 57th Street
Divestiture of Assets Held for Sale
Gross proceeds:	46,300,000
Net assets tendered
Building	22,726,000
Other assets	1,502,000
Subtotal	24,228,000
Less:
Deferred rent credits	1,783,000
Total net assets tendered	22,445,000
Subtotal	23,855,000
Capitalized rent asset	1,852,000
Transaction costs	(2,982,000)
Net gain on transaction	22,725,000
Real estate transfer taxes	1,400,000
Transaction costs consisted of commissions, fees and legal costs	1,600,000
Period ratably recognized of capitalized rent asset			15 months
Foreign tax credits to be utilized	4,400,000
Removal of valuation allowance of deferred tax assets		$ 2,200,000