Unaudited Quarterly Financial Data (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information
Restructuring and reorganization charges recorded during the year	$ 1,300	$ 800	$ 400	$ 600	$ 4,900	$ 7,800		$ 1,200	$ 3,074	$ 13,969	$ 12,405
Impact of Restructuring expenses on EPS	$ 0.03	$ 0.02	$ 0.01	$ 0.01	$ 0.10	$ 0.12		$ 0.02
Effective income tax rate	19.00%	40.00%	43.00%	44.00%	32.00%	48.00%	47.00%	43.00%