Commitments (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Commitments And Contingencies Disclosure [Line Items]
Restricted cash for security deposit	$ 1.5	$ 1.5
Lease, practical expedients, package	true
Executive Severance Plans [Member]
Commitments And Contingencies Disclosure [Line Items]
Other commitments, future minimum payments, remainder of fiscal year	$ 14.1
Corporate Office Facilities [Member]
Commitments And Contingencies Disclosure [Line Items]
Lease payment obligations	$ 58.8
Lease term	15 years
Minimum [Member]
Commitments And Contingencies Disclosure [Line Items]
Initial terms of lease	1 year
Maximum [Member]
Commitments And Contingencies Disclosure [Line Items]
Initial terms of lease	17 years