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Contingencies (Details)
$ in Millions
Mar. 31, 2017
USD ($)
Guarantor Obligations [Line Items]  
Maximum financing amount $ 47.0
Amount outstanding 2.8
Citibank [Member]  
Guarantor Obligations [Line Items]  
Maximum financing amount 27.0
Texas Capital Bank [Member]  
Guarantor Obligations [Line Items]  
Maximum financing amount $ 20.0