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Restructuring and Special Charges (Details) - USD ($)	3 Months Ended		6 Months Ended
Restructuring and Special Charges (Details) - USD ($)	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Restructuring and Special Charges
Restructuring charges	$ 3,026,000	$ 4,242,000	$ 5,170,000	$ 5,305,000
Restructuring and special charges	3,526,000	4,242,000	5,943,000	5,305,000
Other accrued liabilities
Restructuring and Special Charges
Restructuring charges	(60,000)		(108,000)
Pending litigation \| Other accrued liabilities
Restructuring and Special Charges
Loss contingency, accrual, current	56,000		56,000
Implementation and phase-in of the Centers
Restructuring and Special Charges
Restructuring charges	1,973,000	1,196,000	2,402,000	2,259,000
Asset impairments and lease termination costs
Restructuring and Special Charges
Restructuring charges	337,000	0	1,165,000	0
Integration costs related to the GAB Robins acquisition and International segment restructuring
Restructuring and Special Charges
Restructuring charges	716,000	1,938,000	1,603,000	1,938,000
Restructuring activities for U.S. Services segment
Restructuring and Special Charges
Restructuring charges		1,108,000	0	1,108,000
Restructuring activities for U.S. Services segment
Restructuring and Special Charges
Restructuring charges	0
Special charges \| Pending litigation
Restructuring and Special Charges
Legal fees	$ 500,000	$ 0	$ 773,000	$ 0