Restructuring and Reorganization Charges - Schedule of Activity in Business Restructuring and Reorganization Reserves (Details) - USD ($) $ in Thousands		3 Months Ended							12 Months Ended
		Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Rollforward of Restructuring and Reorganization Reserves
Beginning Balance								$ 4,148	$ 4,336	$ 4,148	$ 3,746
Charged to expense during period		$ 1,600	$ 1,300	$ 1,800	$ 1,600	$ 2,800	$ 3,300	900	4,834	8,661	8,796
Cash payments									(5,538)	(9,369)	(5,674)
Adjustment for asset impairment									(438)	(1,851)	(3,135)
Other									562	2,747	415
Ending Balance		822			4,336				822	4,336	4,148
Adjustment for adoption of ASC 842										(7,562)
ASU 2016-02
Rollforward of Restructuring and Reorganization Reserves
Adjustment for adoption of ASC 842	[1]								(2,934)
Termination Benefits
Rollforward of Restructuring and Reorganization Reserves
Beginning Balance								1,116	1,402	1,116	2,414
Charged to expense during period									2,499	6,555	3,693
Cash payments									(3,551)	(6,744)	(4,345)
Other									472	475	(646)
Ending Balance		$ 822			1,402				822	1,402	1,116
Facilities Abandonment
Rollforward of Restructuring and Reorganization Reserves
Beginning Balance								$ 3,032	2,934	3,032	1,332
Charged to expense during period										1,981	2,236
Cash payments										(2,625)	(1,329)
Adjustment for asset impairment											(231)
Other										546	1,024
Ending Balance					$ 2,934					2,934	3,032
Facilities Abandonment | ASU 2016-02
Rollforward of Restructuring and Reorganization Reserves
Adjustment for adoption of ASC 842	[1]								(2,934)
Disposition of Business Operations
Rollforward of Restructuring and Reorganization Reserves
Charged to expense during period										(2,330)	2,904
Adjustment for asset impairment											(2,904)
Other										2,330
Other
Rollforward of Restructuring and Reorganization Reserves
Charged to expense during period									2,335	2,455	(37)
Cash payments									(1,987)
Adjustment for asset impairment									(438)	(1,851)
Other									$ 90	$ (604)	$ 37

[1] With the adoption of ASC 842 on January 1, 2019, the facilities abandonment liabilities of $2.9 million were offset against our initial lease right-of-use assets on our Balance Sheet (see Notes 2 and 6 for further discussion of the adoption of ASC 842).