Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value, Inputs, Level 1

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis

The following table presents certain information for our financial liability that is measured at fair value on a non-recurring basis at December 31:

	2017		2016
	Carrying Amount	Fair Value	Carrying Amount	Fair Value
Liabilities:
6.50% Senior Notes due 2024	900,000	904,500	900,000	812,250

Fair Value, Inputs, Level 3

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis

The following table presents changes in deferred acquisition consideration which is measured at fair value on recurring basis for the years ended December 31:

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
	2017			2016
Beginning balance of contingent payments	$	224,754		$	306,734
Payments (1)	(110,234		)	(105,169		)
Additions (2)	—			16,132
Redemption value adjustments (3)	3,273			13,930
Other (4)	—			(6,412		)
Foreign translation adjustment	1,293			(461		)
Ending balance of contingent payments	$	119,086		$	224,754