Other Transactions	12 Months Ended
Dec. 31, 2015
Other Events and Transactions [Abstract]
Other Transactions	Other Transactions NACoal: On July 31, 2015, NACoal's management and Board of Directors approved cessation of coal production at its Centennial mines in Alabama. NACoal ceased coal production at Centennial during the fourth quarter of 2015. The decision was made as a result of worsening conditions in the Alabama and global coal markets and the adverse effect regulatory changes had on Centennial’s business. As a result of this decision, revisions were made to Centennial's asset retirement obligations due to revised estimated cash flows and the timing of those cash flows, resulting in a $7.5 million charge during the third quarter of 2015. Also as a result of this decision, the Company recognized a $0.6 million charge for severance and other employee benefit costs in 2015. Both of these charges are included in Cost of sales. See Note 7 for further discussion of the Company's asset retirement obligations. As of December 31, 2015, the Company began actively marketing $17.5 million of Centennial's mine machinery and equipment. The Company classified these assets as held for sale during the fourth quarter of 2015 when management approved and committed to a formal plan of sale. During the fourth quarter of 2014, NACoal's long-lived asset evaluation resulted in the Company recording a non-cash, asset impairment charge of $105.1 million on the line "Centennial long-lived asset impairment charge" in the Consolidated Statements of Operations. See Note 10 for further discussion of the Company's long-lived asset impairment. During 2014, NACoal recognized a gain of $3.5 million from the sale of assets to Mississippi Power Company. These assets were previously classified as held for sale. Also during 2014, NACoal recognized an unrelated gain of $2.2 million from the sale of land. During 2013, NACoal recorded a cash outflow for investing activities for $5.0 million for a cost method investment, which is included in "Other non-current assets" on the Consolidated Balance Sheet at December 31, 2015 and 2014. HBB: During 2014, HBB completed the acquisition of Weston Products, LLC, which HBB refers to as Weston Brands, in exchange for cash consideration of $25.4 million, of which $25.0 million was paid at closing and $0.4 million was paid in 2015. The results of Weston Brands operations have been included in the Company's Consolidated Financial Statements since December 16, 2014. See Note 22 for further discussion of the Weston acquisition.

Other Transactions

NACoal: On July 31, 2015, NACoal's management and Board of Directors approved cessation of coal production at its Centennial mines in Alabama. NACoal ceased coal production at Centennial during the fourth quarter of 2015. The decision was made as a result of worsening conditions in the Alabama and global coal markets and the adverse effect regulatory changes had on Centennial’s business. As a result of this decision, revisions were made to Centennial's asset retirement obligations due to revised estimated cash flows and the timing of those cash flows, resulting in a $7.5 million charge during the third quarter of 2015. Also as a result of this decision, the Company recognized a $0.6 million charge for severance and other employee benefit costs in 2015. Both of these charges are included in Cost of sales. See Note 7 for further discussion of the Company's asset retirement obligations.

As of December 31, 2015, the Company began actively marketing $17.5 million of Centennial's mine machinery and equipment. The Company classified these assets as held for sale during the fourth quarter of 2015 when management approved and committed to a formal plan of sale.

During the fourth quarter of 2014, NACoal's long-lived asset evaluation resulted in the Company recording a non-cash, asset impairment charge of $105.1 million on the line "Centennial long-lived asset impairment charge" in the Consolidated Statements of Operations. See Note 10 for further discussion of the Company's long-lived asset impairment.

During 2014, NACoal recognized a gain of $3.5 million from the sale of assets to Mississippi Power Company. These assets were previously classified as held for sale. Also during 2014, NACoal recognized an unrelated gain of $2.2 million from the sale of land.

During 2013, NACoal recorded a cash outflow for investing activities for $5.0 million for a cost method investment, which is included in "Other non-current assets" on the Consolidated Balance Sheet at December 31, 2015 and 2014.

HBB: During 2014, HBB completed the acquisition of Weston Products, LLC, which HBB refers to as Weston Brands, in exchange for cash consideration of $25.4 million, of which $25.0 million was paid at closing and $0.4 million was paid in 2015. The results of Weston Brands operations have been included in the Company's Consolidated Financial Statements since December 16, 2014. See Note 22 for further discussion of the Weston acquisition.