Debt Obligations - Borrowings and Repayments (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Borrowings
Bank borrowings	$ 96,500	$ 64,500
Proceeds from issuance of senior unsecured notes		100,000
Total	96,500	164,500
Repayments
Repayment of bank borrowings	(73,000)	(116,600)
Principal payments on senior unsecured notes	(20,166)	(19,167)
Total	$ (93,166)	$ (135,767)
Private Shelf Agreement Prudential \| Senior Unsecured Notes
Repayments
Debt instrument term			15 years
Face amount of debt			$ 100,000
Fixed interest rate (as a percent)			4.50%

Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

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