Goodwill and Intangibles Asset Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended					6 Months Ended				9 Months Ended
	Dec. 31, 2016		Mar. 31, 2016		Dec. 31, 2015	Sep. 30, 2016		Sep. 30, 2015		Dec. 31, 2016		Mar. 31, 2015
Goodwill [Roll Forward]
Beginning balance	$ 16,463	[1]	$ 2,794		$ 2,794	$ 16,463	[1]	$ 2,794	[1]	$ 16,463	[1]
Additions			13,669
Ending balance	16,463		16,463	[1]	2,794	16,463	[1]	2,794		16,463
Finite-Lived Intangible Assets [Line Items]
Gross balance												$ 69,889
Amortizable Intangibles, Accumulated amortization												(37,998)
Goodwill	16,463	[1]	2,794		2,794	16,463	[1]	2,794	[1]	16,463	[1]	2,794	[1]
Finite-lived Intangible Assets [Roll Forward]
Net balance	64,865		29,248		30,098	67,034		31,891		67,034
Additions			38,499
Amortization expense	(1,085)		(713)		(850)	(2,169)		(1,793)
Net balance	63,780		67,034		29,248	64,865		30,098		63,780
North America
Goodwill [Roll Forward]
Ending balance	2,794									2,794
Finite-Lived Intangible Assets [Line Items]
Goodwill	2,794									2,794
Other Regions
Goodwill [Roll Forward]
Ending balance	13,669									13,669
Finite-Lived Intangible Assets [Line Items]
Goodwill	13,669									$ 13,669
Customer Relationships Intangible
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining useful life in years										12 years 3 months
Amortizable Intangibles, Gross carrying amount												33,700
Amortizable Intangibles, Accumulated amortization												(16,639)
Finite-lived Intangible Assets [Roll Forward]
Net balance	38,536		15,798		16,219	40,206		17,061		$ 40,206
Additions			24,830
Amortization expense	(835)		(422)		(421)	(1,670)		(842)
Net balance	37,701		40,206		15,798	38,536		16,219		$ 37,701
Production and Supply Contract Intangibles
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining useful life in years										4 years
Amortizable Intangibles, Gross carrying amount												14,893
Amortizable Intangibles, Accumulated amortization												(5,786)
Finite-lived Intangible Assets [Roll Forward]
Net balance	8,164		8,328		8,565	8,282		9,107		$ 8,282
Additions			0
Amortization expense	(67)		(46)		(237)	(118)		(542)
Net balance	8,097		8,282		8,328	8,164		8,565		$ 8,097
Internally Developed Software Intangible
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining useful life in years										0 years
Amortizable Intangibles, Gross carrying amount												18,502
Amortizable Intangibles, Accumulated amortization												$ (15,573)
Finite-lived Intangible Assets [Roll Forward]
Net balance	1,702		2,328		2,520	2,083		2,929		$ 2,083
Additions			0
Amortization expense	(183)		(245)		(192)	(381)		(409)
Net balance	$ 1,519		$ 2,083		$ 2,328	$ 1,702		$ 2,520		$ 1,519

[1] Goodwill of $2,794 relates to the North America segment and $13,669 relates to the Other Regions segment.