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Equity - Additional Information (Details) - USD ($)	1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
	Feb. 28, 2018	Jan. 31, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Feb. 29, 2016
Stockholders Equity Note [Line Items]
Net proceeds from issuance of common stock			$ 117,000,000		$ 117,311,000	$ 224,000
Share repurchases					15,544,000
Share Repurchase Plan, February 2016
Stockholders Equity Note [Line Items]
Common stock authorized to repurchase by Board								$ 100,000,000
Shares repurchased pursuant to authorization (in shares)		1,040,829					610,342
Share repurchases		$ 16,000,000					$ 9,000,000
Available authorization remaining for repurchase							$ 77,000,000
Share Repurchase Plan, February 2018
Stockholders Equity Note [Line Items]
Common stock authorized to repurchase by Board	$ 100,000,000
Available authorization remaining for repurchase			$ 100,000,000		$ 100,000,000
Increase in authorized repurchase amount	$ 39,000,000
Equity awards
Stockholders Equity Note [Line Items]
Securities excluded in the calculation of diluted earnings per share (in shares)			7,761	6,149	7,230	5,843
Common Stock
Stockholders Equity Note [Line Items]
Issuance of common stock (in shares)			7,187,500		7,187,500

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The cash inflow from the additional capital contribution to the entity.

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