Segment Reporting (Tables)

6 Months Ended

Jun. 30, 2014

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

For the three months ended June 30, 2014	Specialty Phosphates US & Canada		Specialty Phosphates Mexico		GTSP & Other			Eliminations			Total
Sales	$	157,267	$	40,885	$	21,390		$	—		$	219,542
Intersegment sales	796		15,139		38			(15,973		)	—
Total sales	$	158,063	$	56,024	$	21,428		$	(15,973	)	$	219,542
Operating income	$	21,334	$	10,320	$	155		$	—		$	31,809
Depreciation and amortization expense	$	6,291	$	2,277	$	357		$	—		$	8,925
For the three months ended June 30, 2013	Specialty Phosphates US & Canada		Specialty Phosphates Mexico		GTSP & Other			Eliminations			Total
Sales	$	159,054	$	43,370	$	10,752		$	—		$	213,176
Intersegment sales	778		14,860		128			(15,766		)	—
Total sales	$	159,832	$	58,230	$	10,880		$	(15,766	)	$	213,176
Operating income	$	23,759	$	1,333	$	(2,962	)	$	—		$	22,130
Depreciation and amortization expense	$	6,465	$	2,318	$	682		$	—		$	9,465
For the six months ended June 30, 2014	Specialty Phosphates US & Canada		Specialty Phosphates Mexico		GTSP & Other			Eliminations			Total
Sales	$	308,277	$	85,374	$	42,232		$	—		$	435,883
Intersegment sales	1,550		27,757		39			(29,346		)	—
Total sales	$	309,827	$	113,131	$	42,271		$	(29,346	)	$	435,883
Operating income	$	41,547	$	16,181	$	(3,975	)	$	—		$	53,753
Depreciation and amortization expense	$	11,609	$	5,046	$	744		$	—		$	17,399
For the six months ended June 30, 2013	Specialty Phosphates US & Canada		Specialty Phosphates Mexico		GTSP & Other			Eliminations			Total
Sales	$	310,045	$	82,285	$	35,287		$	—		$	427,617
Intersegment sales	1,301		27,123		239			(28,663		)	—
Total sales	$	311,346	$	109,408	$	35,526		$	(28,663	)	$	427,617
Operating income (a) (b)	$	34,551	$	1,990	$	3,514		$	—		$	40,055
Depreciation and amortization expense	$	13,572	$	4,076	$	1,203		$	—		$	18,851