Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
State	$ 765	$ 542	$ 520
Foreign	199	465	102
Current tax	964	1,007	622
Deferred:
Foreign	2,243	340	(72)
Deferred tax	2,243	340	(72)
Income tax provision	3,207	1,347	550
Reconciliation of effective tax rate and the U.S. Federal statutory income tax rate
Taxes at statutory U.S. federal income tax rate (as a percent)	35.00%	35.00%	35.00%
Dividends paid deduction (as a percent)	(35.00%)	(35.00%)	(35.00%)
State, local, and foreign income taxes, net of federal tax benefit (as a percent)	4.20%	1.22%	0.40%
Effective tax rate (as a percent)	4.20%	1.22%	0.40%
Deferred tax assets	2,329	1,992
Deferred tax assets related to properties located in Australia	2,181	1,414
Deferred tax liabilities	3,643	1,214
Valuation allowance	$ 598	$ 165