Special Charges and Other Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Restructuring Cost and Reserve
Special charges	$ 4,242	$ 0	$ 5,305	$ 0
Establishment of Global Business Services Center
Restructuring Cost and Reserve
Special charges	1,196
Corporate Segment
Restructuring Cost and Reserve
Special charges	4,242	$ 0	5,305	$ 0
Corporate Segment | GAB Robins acquisition integration
Restructuring Cost and Reserve
Special charges	1,046		1,046
Corporate Segment | Establishment of Global Business Services Center
Restructuring Cost and Reserve
Special charges			2,259
Corporate Segment | Other restructuring
Restructuring Cost and Reserve
Special charges	$ 2,000		$ 2,000