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Indebtedness - Senior Credit Facilities (Details)			3 Months Ended	12 Months Ended
	Nov. 16, 2018 USD ($)	Dec. 19, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 01, 2015 USD ($)
Line of Credit Facility [Line Items]
Loss on amendment/refinancing of senior credit agreement		$ 900,000		$ 400,000	$ 900,000	$ 1,300,000
Senior Credit Facilities | Senior credit facility
Line of Credit Facility [Line Items]
Aggregate principal amount		$ 200,000,000.0
Consolidated senior secured leverage ratio		2.75					2.50
Consolidated leverage ratio		3.50
Consolidated leverage ratio after certain permitted acquisitions		4.00
New Term Loan | Senior credit facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity under financing arrangement		$ 350,000,000.0
Participation Foreign Credit Instrument Facility | Letters of credit and guarantees
Line of Credit Facility [Line Items]
Line of credit increase (decrease)	$ 35,000,000
Bilateral foreign credit instrument facility | Letters of credit and guarantees
Line of Credit Facility [Line Items]
Line of credit increase (decrease)	15,000,000
Loss on extinguishment of debt			$ 400,000.0
Revolving loans | Foreign credit instrument facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity under financing arrangement		150,000,000.0
Revolving loans | Domestic revolving credit facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity under financing arrangement		200,000,000.0
Revolving loans | Senior Credit Facilities | Senior credit facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity under financing arrangement	$ 850,000,000.0	900,000,000.0
Revolving loans | New Term Loan | Senior credit facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity under financing arrangement		350,000,000.0
Revolving loans | Participation Foreign Credit Instrument Facility | Letters of credit and guarantees
Line of Credit Facility [Line Items]
Maximum borrowing capacity under financing arrangement		110,000,000.0					$ 145,000,000.0
Revolving loans | Bilateral foreign credit instrument facility | Letters of credit and guarantees
Line of Credit Facility [Line Items]
Maximum borrowing capacity under financing arrangement		$ 40,000,000.0					$ 55,000,000.0
Revolving loans | Foreign credit instrument facility | Senior credit facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity under financing arrangement			$ 50,000,000	$ 50,000,000

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