Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement of Comprehensive Income [Abstract]
Consolidated net income	$ 1,797	$ 8,589	$ 30,902	$ 26,965
Currency translation adjustment, net of tax	3,190	3,276	(11,413)	3,742
Comprehensive income	4,987	11,865	19,489	30,707
Less: Net income allocated to noncontrolling interests	0	0	0	0
Comprehensive income allocated to common stockholders	$ 4,987	$ 11,865	$ 19,489	$ 30,707