Fair Value Measurements Fair Value, Reconciliation of Level 3 (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Liability Value	$ 11,230		$ 0		$ 0
Liability, Issues	3,400		17,755		63,180
Liability, Gain (Loss) Included in Earnings	897	[1]	(4,537)	[1]	203,183	[1]
Liability, Settlements	(4,936)		0		(266,363)
Liability, Purchases, Sales, Issues, Settlements	(4,978)
Liability, Transfers Into Level 3	1,988		(1,988)		0
Ending Liability Value	7,601		11,230		0
Unrealized Gain Loss Still Held	211	[2]	(4,537)	[3]	0	[3]
Available-for-sale Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Asset Value	0
Asset, Purchases	3,000
Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	87
Ending Asset Value	3,087
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Unrealized Gain Loss Still Held	$ (87)	[2]

[1] Changes in the fair value of contingent consideration liabilities are classified within "Acquisition-related expense (benefit), net" on the consolidated statements of operations.

[2] Represents the unrealized (gains) losses recorded in earnings during the year for assets (and liabilities) classified as Level 3 that are still held (or outstanding) at the end of the year.

[3] Represents the net unrealized gains recorded in earnings during the year for liabilities classified as Level 3 that are still held (or outstanding) at the end of the year.