Leases - Narrative (Details) $ in Thousands, ft² in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) ft² country location	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 64,191
Other accrued liabilities	21,932
Other noncurrent liabilities	$ 49,970	$ 0
Option period to terminate leases	3 years
Square feet of office space leased (in sqft) | ft²	1.6
Number of locations with leased office spaces | location	93
Number of countries with leased office spaces | country	48
Rent expense	$ 29,000	$ 30,000	$ 32,000
Optional lease extension term	5 years
Operating lease liability not yet commenced	$ 39,000
Operating lease liability not yet commenced, term	10 years
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Remaining minimum lease terms	1 year
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Remaining minimum lease terms	9 years
ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets				$ 72,000
Other accrued liabilities				25,000
Other noncurrent liabilities				$ 47,000