Debt (Components Of Interest Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Debt [Line Items]
Amortization of amendment and arrangement fees	$ 1,096		$ 1,279		$ 1,764
Commitment fees	1,144		1,532		1,277
Sub-total	2,240		2,811		3,041
Interest expense	35,189	[1]	42,712	[1]	44,429
Other interest expense	864		1,222		1,373
York Property Mortgage [Member]
Debt [Line Items]
Interest expense	16,335		16,512		16,770
Senior Notes [Member]
Debt [Line Items]
Interest expense	15,750		15,750		9,775
Convertible Notes Member
Debt [Line Items]
Interest expense	$ 0		$ 6,417		$ 13,470

[1] Borrowing costs related to the Finance Credit Agreement, which include interest and the amortization of fees, are reflected in the Consolidated Income Statements as the Cost of Finance Revenues (See Note 9).