Goodwill and Other Intangibles Goodwill and Intangible Asset Rollforward (Details) - USD ($) $ in Thousands		3 Months Ended
		Jun. 30, 2015		Mar. 31, 2015	Jun. 30, 2014	Mar. 31, 2014
Goodwill and Intangible Assets [Line Items]
Goodwill	[1]	$ 2,794		$ 2,794	$ 2,794	$ 2,794
Gross balance						69,191
Amortizable Intangibles, Accumulated amortization						(34,466)
Finite-lived Intangible Assets [Roll Forward]
Net balance		31,891			34,725
Additions				429	269
Amortizable Intangibles, Amortization expense		(897)		(2,773)	(759)
Amortizable Intangibles, Net		28,200
Net balance		30,994		31,891	34,235
North America [Member]
Goodwill and Intangible Assets [Line Items]
Goodwill		$ 2,794
Customer Relationships Intangible [Member]
Goodwill and Intangible Assets [Line Items]
Weighted average remaining useful life in years		9 years 9 months
Amortizable Intangibles, Gross carrying amount						33,700
Amortizable Intangibles, Accumulated amortization						(14,954)
Finite-lived Intangible Assets [Roll Forward]
Amortizable Intangibles, Net		$ 17,061			18,746
Additions				0	0
Amortizable Intangibles, Amortization expense		(421)		(1,264)	(421)
Amortizable Intangibles, Net		$ 16,640		17,061	18,325
Production and Supply Contract Intangibles [Member]
Goodwill and Intangible Assets [Line Items]
Weighted average remaining useful life in years		5 years 6 months
Amortizable Intangibles, Gross carrying amount						14,893
Amortizable Intangibles, Accumulated amortization						(4,752)
Finite-lived Intangible Assets [Roll Forward]
Amortizable Intangibles, Net		$ 9,107			10,141
Additions				0	0
Amortizable Intangibles, Amortization expense		(270)		(888)	(146)
Amortizable Intangibles, Net		$ 8,837		9,107	9,995
Internally Developed Software Intangible [Member]
Goodwill and Intangible Assets [Line Items]
Weighted average remaining useful life in years		0 years
Amortizable Intangibles, Gross carrying amount						17,804
Amortizable Intangibles, Accumulated amortization						$ (14,760)
Finite-lived Intangible Assets [Roll Forward]
Amortizable Intangibles, Net		$ 2,929			3,044
Additions				429	269
Amortizable Intangibles, Amortization expense		(206)		(621)	(192)
Amortizable Intangibles, Net		$ 2,723	[2]	$ 2,929	$ 3,121

[1] Goodwill of $2,794 relates to the North America segment.

[2] Estimated amortization expense for the internally developed software is based on costs accumulated as of June 30, 2015. These estimates will change as new costs are incurred and until the software is placed into service in all locations.