Long-Term Debt (Senior Credit Facility) (Details) (USD $)	0 Months Ended			12 Months Ended			0 Months Ended		0 Months Ended	3 Months Ended	0 Months Ended	12 Months Ended						12 Months Ended		0 Months Ended					0 Months Ended			0 Months Ended
	Sep. 25, 2013	Jan. 20, 2012 payment	Jan. 20, 2012 Incremental Senior Credit Facility [Member]	Dec. 31, 2013 Incremental Senior Credit Facility [Member]	Dec. 31, 2013 Incremental Senior Credit Facility [Member] Eight Scheduled Quarterly [Member]	Dec. 31, 2013 Incremental Senior Credit Facility [Member] Four Scheduled Quarterly [Member]	Jul. 08, 2011 Senior Secured Credit Facility [Member]	Dec. 31, 2013 Senior Secured Credit Facility [Member]	Dec. 19, 2012 Secured Credit Facility [Member]	Dec. 31, 2013 Secured Credit Facility [Member]	Jan. 17, 2006 6.125% Notes, Payable January 15, 2016 [Member]	Dec. 31, 2013 6.125% Notes, Payable January 15, 2016 [Member]	Dec. 31, 2012 6.125% Notes, Payable January 15, 2016 [Member]	Dec. 31, 2013 Borrowings [Member] Senior Secured Credit Facility [Member]	Dec. 31, 2013 Standby Letters of Credit Guaranteeing Company Industrial Revenue Bonds [Member] Senior Secured Credit Facility [Member]	Dec. 31, 2013 Standby Letters of Credit Related to Various Insurance Contracts and Foreign Vendor Commitments [Member] Senior Secured Credit Facility [Member]	Dec. 31, 2012 Standby Letters of Credit Related to Various Insurance Contracts and Foreign Vendor Commitments [Member] Senior Secured Credit Facility [Member]	Dec. 31, 2013 Amendment To Senior Credit Facility [Member]	Dec. 31, 2013 Five Year Senior Secured Revolving Credit Facility [Member]	Sep. 25, 2013 Senior Secured Credit Facility [Member]	Jul. 08, 2011 Senior Secured Credit Facility [Member]	Sep. 25, 2013 Senior Secured Credit Facility [Member] Maximum [Member]	Jan. 20, 2012 Senior Secured Credit Facility [Member] Maximum [Member]	Dec. 31, 2013 Senior Secured Credit Facility [Member] Maximum [Member]	Sep. 25, 2013 Senior Secured Credit Facility [Member] Minimum [Member]	Jan. 20, 2012 Senior Secured Credit Facility [Member] Minimum [Member]	Dec. 31, 2013 Senior Secured Credit Facility [Member] Minimum [Member]	Sep. 25, 2013 Federal Funds [Member] Senior Secured Credit Facility [Member] Alternative B [Member]	Jan. 20, 2012 Federal Funds [Member] Senior Secured Credit Facility [Member] Alternative B [Member]	Sep. 25, 2013 Monthly Libor [Member] Senior Secured Credit Facility [Member] Alternative B [Member]	Jan. 20, 2012 Monthly Libor [Member] Senior Secured Credit Facility [Member] Alternative B [Member]	Sep. 25, 2013 LIBOR [Member] Senior Secured Credit Facility [Member] Alternative A [Member] Maximum [Member]	Jan. 20, 2012 LIBOR [Member] Senior Secured Credit Facility [Member] Alternative A [Member] Maximum [Member]	Sep. 25, 2013 LIBOR [Member] Senior Secured Credit Facility [Member] Alternative A [Member] Minimum [Member]	Jan. 20, 2012 LIBOR [Member] Senior Secured Credit Facility [Member] Alternative A [Member] Minimum [Member]	Sep. 25, 2013 LIBOR [Member] Senior Secured Credit Facility [Member] Alternative B [Member] Maximum [Member]	Jan. 20, 2012 LIBOR [Member] Senior Secured Credit Facility [Member] Alternative B [Member] Maximum [Member]	Sep. 25, 2013 LIBOR [Member] Senior Secured Credit Facility [Member] Alternative B [Member] Minimum [Member]	Jan. 20, 2012 LIBOR [Member] Senior Secured Credit Facility [Member] Alternative B [Member] Minimum [Member]
Line of Credit Facility [Line Items]
Line of credit facility, initiation date																		Jan. 20, 2012	Jul. 08, 2011
Basis spread on debt instrument									0.75%																			0.50%	0.50%	1.00%	1.00%	1.75%	2.00%	1.00%	1.25%	0.75%	1.00%	0.00%	0.25%
Commitment fee percentage										0.30%												0.25%	0.40%		0.125%	0.25%
Consolidated interest coverage ratio																									3.0		3.0
Consolidated net leverage ratio																						3.75		3.75
Available amount under credit facility								$ 541,459,000
Utilized borrowings under credit facility								458,541,000						364,005,000
Standby letters of credit for various insurance contracts and commitments to foreign vendors															46,823,000	47,713,000	50,540,000
Maximum borrowing capacity under credit facility			150,000,000				900,000,000		300,000,000											1,000,000,000
Line of credit facility, term																				5 years
Term of line of credit (years)									3 years												5 years
Payment of financing costs	1,836,000		1,018,000				8,285,000
Number of scheduled principal payments, tranche one		8
Number of scheduled principal payments, tranche two		4
Periodic payment, principal				5,625,000	1,875,000	3,750,000
Unamortized financing costs							$ 12,277,000													$ 11,440,000
Interest rate percentage											6.125%	6.125%	6.125%
Notes payable, maturity date											Jan. 15, 2016	Jan. 15, 2016	Jan. 15, 2016