Debt Including Capital Lease Obligations - Carrying and Estimated Fair Value Table (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013		Mar. 31, 2013		Feb. 28, 2013	Feb. 05, 2013
Debt Instrument [Line Items]
Carrying Value - Capital lease obligations	$ 42,477	[1]	$ 39,025	[1]	$ 690
Estimated Fair Value - Capital lease obligations	42,000	[1],[2]	39,000	[1],[2]	700	[2]
Less current portion	(4,169)		(2,271)		(1,755)
Total long-term debt and capital lease obligations	635,104		629,353		611,678
4.25% Convertible Senior Notes
Debt Instrument [Line Items]
Stated interest rate on debt instrument	4.25%		4.25%		4.25%
Carrying Value	167,006		164,050		155,701
Estimated Fair Value	201,000	[2]	194,000	[2]	183,000	[2]
ABL Revolver
Debt Instrument [Line Items]
Carrying Value	5,000		0		27,586
Estimated Fair Value	5,000	[2]	0		27,500	[2]
Other debt [Member]
Debt Instrument [Line Items]
Estimated Fair Value	6,000	[2]
Other Long-term Debt	6,541
7.875% Senior Notes | Senior notes
Debt Instrument [Line Items]
Stated interest rate on debt instrument	7.875%		7.875%		7.875%		7.875%	7.875%
Carrying Value	412,249		422,174		421,956
Estimated Fair Value	462,000	[2]	459,000	[2]	446,000	[2]
ABL Term Loan | ABL Term Loan
Debt Instrument [Line Items]
Carrying Value	6,000		6,375		7,500
Estimated Fair Value	$ 6,000	[2]	$ 6,000	[2]	$ 7,500	[2]

[1] Capital lease obligations at March 31, 2014 and December 31, 2013 include the borrowings for the salad production and warehousing facility in the Midwest. See further description of the build-to-suit lease below

[2] The fair value of the senior notes is based on observable inputs, which include quoted prices for similar assets or liabilities in an active market and market-corroborated inputs (Level 2). All other debt may be traded on the secondary loan market, and the fair value is based on either the last available trading price, if recent, or trading prices of comparable debt (Level 3). See also Note 9 for discussion of fair value.