Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
Consolidated net income	$ 46,682	$ 42,092	$ 44,584
Currency translation adjustment, net of tax	(15,985)	3,496	(1,999)
Comprehensive income	30,697	45,588	42,585
Net income allocated to noncontrolling interests	0	0	6
Comprehensive income allocated to common stockholders	$ 30,697	$ 45,588	$ 42,579