Related Party Transactions (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Related Party Transaction [Line Items]
Rent expense for corporate headquarters	$ 1,338	$ 1,029	$ 1,392
Significant Shareholders [Member]
Related Party Transaction [Line Items]
Rent revenue recognized	744	842	864
Vorando Realty Trust [Member]
Related Party Transaction [Line Items]
Rent expense for corporate headquarters	1,225	919	1,281
Short-term Debt [Member] | NLS Entity [Member]
Related Party Transaction [Line Items]
Interest bearing, non-recourse mortgage notes, related party			$ 20,077