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Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Income - Share Repurchases - Additional Information (Details) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Stockholders Equity Including Portion Attributable To Noncontrolling Interest [Abstract]
Authorized amount			$ 200,000,000.0
Number of shares repurchased during period (in shares)	0	2,294,235	2,294,235
Shares repurchased during period		$ 55,057,000	$ 55,100,000
Stock repurchase fees		$ 100,000	$ 100,000
Remaining authorized repurchase amount	$ 144,900,000

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Stock repurchase program, fees.

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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