Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Changes in goodwill
Goodwill, net, balance at the beginning of the period	$ 128,725
Adjustment to prior acquisitions	(791)
Goodwill, net, balance at the end of the period	127,934
Other intangible assets, net:
Other intangible assets, net, balance at beginning of the period	93,278
Purchases of intangible assets	30
Amortization expense	(1,886)
Changes in foreign currency exchange rates	(11)
Other intangible assets, net, balance at end of the period	$ 91,411