Restructuring Charges (Details) (USD $)	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Changes in restructuring liabilities, recorded in other accrued expenses
Restructuring charges (credit)	$ (102,000)		$ 349,000
2013 Plan
Restructuring Charges
Expected number of employees to be impacted by the restructuring	250
Restructuring and related cost, expected cost	13,000,000
Restructuring charges, incurred to date			13,008,000	[1]
Changes in restructuring liabilities, recorded in other accrued expenses
Restructuring liability, as of January 1, 2014	7,454,000
Restructuring charges (credit)	(413,000)
Non-cash items	0
Cash paid	(4,625,000)
Foreign exchange rate changes	(58,000)
Restructuring liability, as of March 31, 2014	2,358,000
2013 Plan | North America
Restructuring Charges
Restructuring charges, incurred to date			600,000	[1]
Changes in restructuring liabilities, recorded in other accrued expenses
Restructuring charges (credit)	(60,000)
2013 Plan | International
Restructuring Charges
Restructuring charges, incurred to date			11,651,000	[1]
Changes in restructuring liabilities, recorded in other accrued expenses
Restructuring charges (credit)	(465,000)
2013 Plan | Other
Restructuring Charges
Restructuring charges, incurred to date			57,000	[1]
Changes in restructuring liabilities, recorded in other accrued expenses
Restructuring charges (credit)	(7,000)
2013 Plan | Corporate
Restructuring Charges
Restructuring charges, incurred to date			700,000	[1]
Changes in restructuring liabilities, recorded in other accrued expenses
Restructuring charges (credit)	119,000
2012 Plan
Restructuring Charges
Restructuring charges, incurred to date			11,794,000	[2]
Changes in restructuring liabilities, recorded in other accrued expenses
Restructuring charges (credit)	311,000
2012 Plan | North America
Restructuring Charges
Restructuring charges, incurred to date			1,728,000	[2]
Changes in restructuring liabilities, recorded in other accrued expenses
Restructuring charges (credit)	23,000
2012 Plan | International
Restructuring Charges
Restructuring charges, incurred to date			7,340,000	[2]
Changes in restructuring liabilities, recorded in other accrued expenses
Restructuring charges (credit)	260,000
2012 Plan | Corporate
Restructuring Charges
Restructuring charges, incurred to date			2,726,000	[2],[3]
Changes in restructuring liabilities, recorded in other accrued expenses
Restructuring charges (credit)	28,000	[3]
2012 Plan | Office Closures
Changes in restructuring liabilities, recorded in other accrued expenses
Restructuring liability, as of January 1, 2014	2,770,000
Restructuring charges (credit)	311,000
Non-cash items	0
Cash paid	(515,000)
Foreign exchange rate changes	1,000
Restructuring liability, as of March 31, 2014	$ 2,567,000

[1] As a majority of the actions have been completed, the total charges to date approximate the total anticipated charges by segment.

[2] Our restructuring charges, particularly lease-related office closure costs, are subject to estimate. If we are unable to find tenants for vacated offices or sub-lease terms are different from our assumptions, our actual restructuring charges will differ from our current estimates.

[3] 2014 and 2013 corporate restructuring charges include costs for administrative facility consolidation.