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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On February 1, 2016, the Company's Board of Directors declared a quarterly dividend of $0.125 per common share. The dividend was paid on February 29, 2016, to shareholders of record as of the close of business on February 15, 2016 and resulted in a cash outlay of approximately $1.5 million. As discussed in Note 12, on March 7, 2016 the United States District Court for the Eastern District of Arkansas issued an order granting, in part, IPSCO's motion for fees and costs and awarding $2.2 million to IPSCO, which the Company accrued for as of December 31, 2015. ATM expects to appeal that decision.