Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
U.S. Plan
Components of net periodic benefit cost/(income):
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	266	301	532	602
Expected return on plan assets	(322)	(324)	(644)	(648)
Recognized loss	41	0	81	0
Net periodic benefit cost/(income)	(15)	(23)	(31)	(46)
Australian Plan
Components of net periodic benefit cost/(income):
Service cost	234	341	480	633
Interest cost	406	615	830	1,142
Expected return on plan assets	(370)	(560)	(756)	(1,040)
Recognized loss	0	0	0	0
Net periodic benefit cost/(income)	270	396	554	735
Canadian Plan
Components of net periodic benefit cost/(income):
Service cost	48	45	97	90
Interest cost	49	(18)	98	(36)
Expected return on plan assets	(65)	0	(132)	0
Recognized loss	1	0	3	0
Net periodic benefit cost/(income)	$ 33	$ 27	$ 66	$ 54