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Long-Term Debt (Narrative) (Details) (USD $)
 3 Months Ended 3 Months Ended
Mar. 31, 2014
Mar. 31, 2014
Senior Credit Agreement [Member]
Mar. 31, 2013
Senior Subordinated 8% Notes, Due December 1, 2015 [Member]
Mar. 31, 2014
Senior Subordinated 8% Notes, Due December 1, 2015 [Member]
Mar. 31, 2014
Revolving Credit Facility [Member]
Mar. 31, 2014
Senior Subordinated 6.25% Notes Due February 1, 2021 [Member]
Jan. 31, 2013
Senior Subordinated 6.25% Notes Due February 1, 2021 [Member]
Mar. 31, 2014
Minimum [Member]
Revolving Credit Facility [Member]
Mar. 31, 2014
Maximum [Member]
Revolving Credit Facility [Member]
Debt Instrument [Line Items]                  
Standby letters of credit   $ 12,868,000              
Revolving credit facility, availability amount         116,712,000        
Maximum borrowing capacity under the revolving credit facility   200,000,000              
Revolving credit facility, increase, additional borrowings   250,000,000              
Long-term debt description

Borrowings under the Senior Credit Agreement are secured by the trade receivables, inventory, personal property, equipment, and certain real property of the Company's significant domestic subsidiaries. The Senior Credit Agreement is also guaranteed by each of the Company's significant domestic subsidiaries. The Senior Credit Agreement provides for a revolving credit facility and letters of credit in an aggregate amount that does not exceed the lesser of (i) $200 million and (ii) a borrowing base determined by reference to the trade receivables, inventories, and property, plant, and equipment of the Company's significant domestic subsidiaries. The Company can request additional financing from the banks to increase the revolving credit facility to $250 million under the terms of the Senior Credit Agreement.

The terms of the Senior Credit Agreement provide that the revolving credit facility will terminate on October 10, 2016. Interest rates on the revolving credit facility are based on the London Interbank Offering Rate (LIBOR) plus an additional margin of 2.0% to 2.5%. In addition, the revolving credit facility is subject to an annual commitment fee calculated as 0.375% of the daily average undrawn balance.

Standby letters of credit of $12,868,000 have been issued under the Senior Credit Agreement to third parties on behalf of the Company as of March 31, 2014. These letters of credit reduce the amount otherwise available under the revolving credit facility. As of March 31, 2014, based upon the Company's current borrowing base calculation, the Company had $116,712,000 of availability under the revolving credit facility.

On a trailing four-quarter basis, the Senior Credit Agreement includes a single financial covenant that requires the Company to maintain a minimum fixed charge coverage ratio of 1.25 to 1.00 at the end of each quarter. As of March 31, 2014, the Company was in compliance with this financial covenant. The Senior Credit Agreement contains other provisions and events of default that are customary for similar agreements and may limit the Company's ability to take various actions.

On January 31, 2013, the Company issued $210 million of 6.25% Senior Subordinated Notes (6.25% Notes) due February 1, 2021. In connection with the issuance of the 6.25% Notes, the Company initiated a tender offer for the purchase of the outstanding $204 million of 8% Senior Subordinated Notes (8% Notes). Simultaneously with the closing of the sale of the 6.25% Notes, the Company purchased tendered notes or called for redemption of all of the remaining 8% Notes that were not purchased. In connection with the redemption and tender offer, the Company satisfied and discharged its obligations under the 8% Notes during the first quarter of 2013. The Company recorded a charge of approximately $7,166,000 in the first quarter of 2013, including $3,702,000 for the prepayment premium paid to holders of the 8% Notes, $2,199,000 to write-off deferred financing fees and $1,265,000 for the unamortized original issue discount related to the 8% Notes. In connection with the issuance of the 6.25% Notes, the Company paid $3,755,000 in placement and other fees which are recorded as deferred financing costs and included in other assets.

                
Revolving credit facility termination date         Oct. 10, 2016        
Revolving credit facility, annual commitment fee         0.375%        
LIBOR floor, plus               2.00% 2.50%
Senior Subordinated Notes, interest rate       8.00%   6.25%      
Fixed charge coverage ratio   125.00%              
Debt instrument, issuance date           Jan. 31, 2013      
Debt instrument, issued value       204,000,000     210,000,000    
Debt instrument, maturity date           Feb. 01, 2021      
Prepayment premium for extinguishment of debt     3,702,000            
Loss on extinguishment of debt     7,166,000            
Write-off deferred financing fees     2,199,000            
Write off of debt discount     1,265,000            
Placement and other fees           $ 3,755,000