Nature of Operations and Basis of Presentation	12 Months Ended
Dec. 31, 2017
Disclosure Nature Of Operations And Basis Of Presentation Additional Information [Abstract]
Nature of Operations and Basis of Presentation	Nature of Operations and Basis of Presentation Clearwater Paper manufactures quality consumer tissue, away-from-home tissue, parent roll tissue, bleached paperboard and pulp at manufacturing facilities across the nation. The company is a premier supplier of private label tissue to major retailers and wholesale distributors, including grocery, drug, mass merchants and discount stores. In addition, the company produces bleached paperboard used by quality-conscious printers and packaging converters, and offers services that include custom sheeting, slitting and cutting. Clearwater Paper's employees build shareholder value by developing strong customer relationships through quality and service. Unless the context otherwise requires or unless otherwise indicated, references in this report to “Clearwater Paper Corporation,” “we,” “our,” “the company” and “us” refer to Clearwater Paper Corporation and its subsidiaries. On February 17, 2014, we announced the permanent and immediate closure of our Long Island, New York, tissue converting and distribution facility. We have incurred $24.6 million of costs associated with the closure, of which $1.4 million was incurred in 2017 primarily related to a facility lease that expired in 2017. On December 16, 2016, we acquired Manchester Industries, or Manchester, an independently-owned paperboard sales, sheeting and distribution supplier to the packaging and commercial print industries, for total consideration of $71.7 million. The acquisition of Manchester's customers extends our reach and service platform to small and mid-sized folding carton plants, offering a range of converting services that include custom sheeting, slitting and cutting. Manchester's operations subsequent to the acquisition date are reflected in our financial statements. On March 31, 2017, we closed our Oklahoma City, Oklahoma converting facility. Notwithstanding the closure, we remain subject to the terms of a long-term master lease applicable to the facility. In October 2017, we transferred to a third party substantially all of the remaining fixed assets and supplies inventory located at this facility and subleased the facility to the third party for the remaining term of the master lease for the facility. In connection with the transfer of fixed assets, we recorded a loss of $4.3 million in the third quarter of 2017 related primarily to the write down of the transferred assets to their held-for-sale value, and a loss of $3.2 million in the fourth quarter of 2017 related to the execution of the sublease agreement, which is included in “Selling, general and administrative expenses” in our Consolidated Statement of Operations. The sublease agreement is expected to substantially reduce our cash requirements under the master lease over the term of the sublease. In addition to the above amounts, we incurred $7.2 million of closure-related costs associated with the Oklahoma City facility for the twelve months ended December 31, 2017, which is largely included in "Cost of sales" in our Consolidated Statement of Operations. These consolidated financial statements include the financial condition and results of operations of Clearwater Paper Corporation and its wholly-owned subsidiaries. All intercompany transactions and balances between operations within the company have been eliminated.

Nature of Operations and Basis of Presentation

Clearwater Paper manufactures quality consumer tissue, away-from-home tissue, parent roll tissue, bleached paperboard and pulp at manufacturing facilities across the nation. The company is a premier supplier of private label tissue to major retailers and wholesale distributors, including grocery, drug, mass merchants and discount stores. In addition, the company produces bleached paperboard used by quality-conscious printers and packaging converters, and offers services that include custom sheeting, slitting and cutting. Clearwater Paper's employees build shareholder value by developing strong customer relationships through quality and service.

Unless the context otherwise requires or unless otherwise indicated, references in this report to “Clearwater Paper Corporation,” “we,” “our,” “the company” and “us” refer to Clearwater Paper Corporation and its subsidiaries.

On February 17, 2014, we announced the permanent and immediate closure of our Long Island, New York, tissue converting and distribution facility. We have incurred $24.6 million of costs associated with the closure, of which $1.4 million was incurred in 2017 primarily related to a facility lease that expired in 2017.

On December 16, 2016, we acquired Manchester Industries, or Manchester, an independently-owned paperboard sales, sheeting and distribution supplier to the packaging and commercial print industries, for total consideration of $71.7 million. The acquisition of Manchester's customers extends our reach and service platform to small and mid-sized folding carton plants, offering a range of converting services that include custom sheeting, slitting and cutting. Manchester's operations subsequent to the acquisition date are reflected in our financial statements.

On March 31, 2017, we closed our Oklahoma City, Oklahoma converting facility. Notwithstanding the closure, we remain subject to the terms of a long-term master lease applicable to the facility. In October 2017, we transferred to a third party substantially all of the remaining fixed assets and supplies inventory located at this facility and subleased the facility to the third party for the remaining term of the master lease for the facility. In connection with the transfer of fixed assets, we recorded a loss of $4.3 million in the third quarter of 2017 related primarily to the write down of the transferred assets to their held-for-sale value, and a loss of $3.2 million in the fourth quarter of 2017 related to the execution of the sublease agreement, which is included in “Selling, general and administrative expenses” in our Consolidated Statement of Operations. The sublease agreement is expected to substantially reduce our cash requirements under the master lease over the term of the sublease. In addition to the above amounts, we incurred $7.2 million of closure-related costs associated with the Oklahoma City facility for the twelve months ended December 31, 2017, which is largely included in "Cost of sales" in our Consolidated Statement of Operations.

These consolidated financial statements include the financial condition and results of operations of Clearwater Paper Corporation and its wholly-owned subsidiaries. All intercompany transactions and balances between operations within the company have been eliminated.