Fair Value Measurements - Input Hierarchy of Items Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Total Assets / Liabilities at Fair Value
Financial Assets:
Derivative financial instruments	$ 0	$ 186	$ 1,029
Securitized beneficial interests	14,385	40,332	24,659
Total assets	14,385	40,518	25,688
Financial Liabilities:
Long-term debt	559,021	830,785	742,755
Guarantees	1,112	3,714	2,890
Total liabilities	560,133	834,499	745,645
Level 2
Financial Assets:
Derivative financial instruments	0	186	1,029
Securitized beneficial interests	0	0	0
Total assets	0	186	1,029
Financial Liabilities:
Long-term debt	558,401	830,082	742,047
Guarantees	0	0	0
Total liabilities	558,401	830,082	742,047
Level 3
Financial Assets:
Derivative financial instruments	0	0	0
Securitized beneficial interests	14,385	40,332	24,659
Total assets	14,385	40,332	24,659
Financial Liabilities:
Long-term debt	620	703	708
Guarantees	1,112	3,714	2,890
Total liabilities	$ 1,732	$ 4,417	$ 3,598