Segment Reporting (Details) (USD $)	3 Months Ended
	Mar. 31, 2014 segment	Mar. 31, 2013	Dec. 31, 2013
Segment Reporting
Number of operating segments	4
Segment reporting
Total revenues	$ 137,609,000	$ 132,050,000
Income (loss) before income tax expense (benefit)	18,420,000	10,952,000
Identifiable assets	3,030,560,000	4,001,363,000	2,209,887,000
U.S. Operations
Segment reporting
Total revenues	75,667,000	81,243,000
Income (loss) before income tax expense (benefit)	4,848,000	5,740,000
Identifiable assets	1,068,577,000	1,888,817,000
Duplicate rent charges		1,300,000
Canadian Operations
Segment reporting
Total revenues	19,336,000	18,544,000
Income (loss) before income tax expense (benefit)	4,559,000	2,576,000
Identifiable assets	97,016,000	97,632,000
European Operations
Segment reporting
Total revenues	32,832,000	20,950,000
Income (loss) before income tax expense (benefit)	10,742,000	3,501,000
Identifiable assets	1,268,145,000	1,271,052,000
Asia Pacific Operations
Segment reporting
Total revenues	9,774,000	11,313,000
Income (loss) before income tax expense (benefit)	(1,729,000)	(865,000)
Identifiable assets	$ 596,822,000	$ 743,862,000