Income Taxes (Details 2) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Classification of deferred tax amounts
Current assets		$ 4,222
Non-current assets	$ 13,280
Non-current liabilities	17,928	11,670
Deferred tax assets:
Allowances for doubtful accounts	1,976	1,091
Deferred branch tax benefit	15,813	16,592
Deferred income	29	31
Fixed assets	39
Accrued expenses	1,440	3,299
Foreign tax credit	5,572	2,592
Stock compensation	3,465	2,918
Pension	651	1,041
Intangibles	2,376	2,651
Deferred tax assets, gross	31,361	30,215
Deferred tax liabilities:
Prepaid expenses	(196)	(200)
Intangibles	(23,000)	(25,807)
Property and equipment	(3,098)	(4,032)
Amortization expense	(9,715)	(7,624)
Total deferred tax liabilities	(36,009)	(37,663)
Net deferred tax liabilities	(4,648)	$ (7,448)
Early adoption effect due to adjustments for new accounting principle
Classification of deferred tax amounts
Non-current assets	9,800
Non-current liabilities	$ 17,300