Income Taxes - Uncertain Tax Positions (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Interest and penalties	$ 100,000	$ 100,000	$ 200,000
Schedule reconciliation of gross unrecognized tax benefits
Beginning balance	5,006,000	5,387,000	5,411,000
Additions as a result of tax provisions taken during the current year	357,000	261,000	138,000
Subtractions as a result of tax provisions taken during the prior year	(126,000)	(346,000)	(67,000)
Foreign currency translation	45,000	0	133,000
Lapse in statute of limitations	(63,000)	(296,000)	(224,000)
Settlements	(1,729,000)	0	(15,000)
Acquisition	0	0	11,000
Ending balance	3,490,000	5,006,000	5,387,000
Unrecognized tax benefits that would impact effective tax rate	3,200,000	4,700,000
Decrease in unrecognized tax benefits is reasonably possible in next 12 months	200,000
Interest on income taxes accrued	100,000
Unrecognized tax benefits including interest and penalties	3,600,000	5,100,000
Unrecognized tax benefits, income tax interest and penalties accrued, current	1,500,000
Unrecognized tax benefits, income tax penalties and interest accrued, noncurrent	$ 2,100,000