Borrowings - Note Refinancing (Details) - Senior Notes - Post-Modification Notes - USD ($)		6 Months Ended
	Jul. 27, 2017	Jun. 30, 2018
Debt Instrument [Line Items]
Debt instrument, face amount		$ 85,937,000
Debt instrument, basis spread on variable rate		3.50%
Debt instrument, redemption notice, number of days	30 days
Debt instrument, redemption price, percentage of principal amount redeemed	101.00%
London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	3.50%