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

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Debt (Details Textual) - USD ($) $ in Millions	1 Months Ended
Debt (Details Textual) - USD ($) $ in Millions	May 31, 2017	Sep. 30, 2019	Dec. 31, 2018
Senior Notes due 2024
Debt Instrument [Line Items]
Net unamortized debt issuance costs		$ 3.3	$ 4.1
Debt Instrument, Face Amount	$ 250.0
Proceeds from Debt	$ 245.0
Revolving Credit Facility
Debt Instrument [Line Items]
Net unamortized debt issuance costs		2.5	$ 2.2
Line of credit facility maximum borrowing capacity		250.0
Line of Credit Facility, Current Borrowing Capacity		$ 250.0
Stated interest rate		5.60%
Interest rate swap
Debt Instrument [Line Items]
Derivative, Notional Amount		$ 37.5