Goodwill and Other Intangible Assets Goodwoll and Other Intangible Assets (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Goodwill [Line Items]
Reporting unit, percentage of fair value in excess of carrying amount					8.00%
Impairment of definite-lived intangibles and other long-lived assets			$ 0
Goodwill impairment	$ 42,000,000	$ 0	42,000,000	$ 0
Goodwill (Note 17)	$ 23,105,000	$ 63,934,000	23,105,000	$ 63,934,000	$ 63,934,000
Plant Nutrient
Goodwill [Line Items]
Long-term earnings growth rate	2.00%
Weighted average cost of capital	10.10%
Goodwill impairment	$ 42,000,000		42,000,000
Goodwill (Note 17)	$ 17,767,000		$ 17,767,000		$ 59,767,000