Debt Including Capital Lease Obligations - Build-to-suit Lease (Details) (USD $)							1 Months Ended
	Jun. 30, 2014		Dec. 31, 2013		Jun. 30, 2013		Jun. 30, 2012 Midwest [Member] Salad production and warehousing facility renewal_option	Mar. 31, 2014 Midwest [Member] Salad production and warehousing facility	Jun. 30, 2014 Midwest [Member] Warehouse In Service [Member] Long-term Debt [Member]	Dec. 31, 2013 Midwest [Member] Warehouse In Service [Member] Long-term Debt [Member]	Jun. 30, 2013 Midwest [Member] Warehouse In Service [Member] Long-term Debt [Member]	Jun. 30, 2013 Midwest [Member] Construction in progress Other liabilities	Jun. 30, 2013 Midwest [Member] Construction in progress Accrued liabilities
Capital Leased Assets [Line Items]
Capital Lease Obligations, Current									$ 1,000,000	$ 1,000,000	$ 1,000,000
Lease term							20 years
Number of lease extensions							2
Lease extension term							5 years
Lessee Leasing Arrangements, Capital Leases, Discount Rate								6.30%
Carrying Value - Capital lease obligations	$ 42,558,000	[1]	$ 39,025,000	[1]	$ 14,250,000	[1]			$ 42,000,000	$ 38,000,000	$ 39,000,000	$ 23,000,000	$ 2,000,000

[1] Capital lease obligations include the borrowings for the salad production and warehousing facility in the Midwest. See further description of the build-to-suit lease below