Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Consolidated net income	$ 8,054	$ 15,487	$ 8,292	$ 29,104
Currency translation adjustment, net of tax	2,110	(13,145)	4,822	(14,603)
Comprehensive income	10,164	2,342	13,114	14,501
Less: Net income allocated to noncontrolling interests	0	0	0	0
Comprehensive income allocated to common stockholders	$ 10,164	$ 2,342	$ 13,114	$ 14,501