Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Information
Total revenues	$ 220,395	$ 216,264	$ 439,936	$ 434,844
Earnings before interest, taxes, amortization, and restructuring	5,639	4,811	10,774	12,069
Amortization of intangible assets		(161)		(325)
Restructuring charges	(604)		(953)
OPERATING INCOME FROM CONTINUING OPERATIONS	5,035	4,650	9,821	11,744
Unallocated expenses of discontinued operations
Segment Information
Earnings before interest, taxes, amortization, and restructuring		(189)		(622)
International
Segment Information
Total revenues	113,935	105,933	226,610	219,513
Earnings before interest, taxes, amortization, and restructuring	6,000	5,623	10,951	12,908
Restructuring charges	(504)		(930)
North America
Segment Information
Total revenues	106,759	110,514	213,928	215,973
Earnings before interest, taxes, amortization, and restructuring	8,502	7,608	16,598	14,618
Restructuring charges	(39)		104
Other
Segment Information
Total revenues	895	736	1,742	1,507
Earnings before interest, taxes, amortization, and restructuring	82	80	118	130
Inter-segment
Segment Information
Total revenues	(1,194)	(919)	(2,344)	(2,149)
Corporate
Segment Information
Earnings before interest, taxes, amortization, and restructuring	(8,945)	(8,311)	(16,893)	(14,965)
Restructuring charges	$ (61)		$ (127)