Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements Fair Value Measurements - Cross Currency Swaps (Details)

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Fair Value Measurements Fair Value Measurements - Cross Currency Swaps (Details) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Fair Value Disclosures [Abstract]      
Intercompany receivable $ 89,539,000 $ 89,539,000  
Derivative [Line Items]      
Unrealized gain on intercompany note $ 385,000    
Net gain   0 $ 7,000
Cross Currency Swap      
Derivative [Line Items]      
Loss on long-term derivative contract   (897)  
Net gain   $ 249,000