Segment Reporting (Tables)

6 Months Ended

Jun. 30, 2015

Segment Reporting [Abstract]

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

For the three months ended June 30, 2015	Specialty Phosphates US & Canada		Specialty Phosphates Mexico		GTSP & Other		Eliminations			Total
Sales	$	148,376	$	43,886	$	25,032	$	—		$	217,294
Intersegment sales	2,535		14,495		86		(17,116		)	—
Total sales	$	150,911	$	58,381	$	25,118	$	(17,116	)	$	217,294
Operating income	$	13,470	$	7,362	$	433	$	—		$	21,265
Depreciation and amortization expense	$	6,786	$	3,196	$	780	$	—		$	10,762
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