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Subsequent Event - Senior Credit Facilities (Details) - USD ($) $ in Thousands			12 Months Ended
	Jan. 31, 2019	Jan. 22, 2019	Dec. 31, 2018	Dec. 31, 2012	Feb. 01, 2019
Subsequent Event
Amount of senior credit facilities			$ 150,000	$ 50,000
Increase to aggregate commitments				$ 100,000
Credit Agreement
Subsequent Event
Amount of senior credit facilities			250,000
Increase to aggregate commitments			50,000
Credit Agreement | Maximum
Subsequent Event
Amount of senior credit facilities			$ 300,000
Subsequent Event | LIBOR
Subsequent Event
Margin on interest rate		2.00%
Subsequent Event | Base rate
Subsequent Event
Margin on interest rate		0.75%
Subsequent Event | Federal funds effective rate
Subsequent Event
Margin on interest rate		0.50%
Subsequent Event | One month LIBOR
Subsequent Event
Margin on interest rate		1.25%
Subsequent Event | Senior secured revolving credit facility
Subsequent Event
Amount of senior credit facilities		$ 62,500
Term of senior credit facility		5 years
Increase in principal amount of the term loan and revolving commitments					$ 18,750
Principal amount of aggregate commitments					81,250
Subsequent Event | First Amendment to the Credit Agreement
Subsequent Event
Amount of senior credit facilities	$ 250,000
Increase to aggregate commitments	75,000
Subsequent Event | First Amendment to the Credit Agreement | Maximum
Subsequent Event
Amount of senior credit facilities	$ 325,000
Subsequent Event | Senior secured term loan facility
Subsequent Event
Amount of senior credit facilities		$ 187,500
Term of senior credit facility		5 years
Repayments of Secured Debt		$ 60,000
Cash collateral released on repayment of debt		$ 61,700
Increase in principal amount of the term loan and revolving commitments					56,250
Principal amount repayment instalment percentage (in percent)		5.00%
Quarterly repayment installments of principal amount of the term facility		$ 12,188
Principal amount of aggregate commitments					$ 243,750

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- Definition

Increase in the amount of the term loan and the aggregate revolving commitments.

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Amount of cash collateral released on repayment of debt.

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Percentage of equal instalments for repayment of principal amount of the term facility.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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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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Amount of increase (decrease) of the credit facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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