Debt Including Capital Lease Obligations - Build-to-suit Lease (Details) (USD $)	1 Months Ended
	Jun. 30, 2012 renewal_option	Mar. 31, 2015		Dec. 31, 2014		Mar. 31, 2014
Capital Leased Assets [Line Items]
Carrying Value - Capital lease obligations		$ 41,444,000	[1]	$ 41,891,000	[1]	$ 42,477,000	[1]
Midwest [Member] | Salad production and warehousing facility
Capital Leased Assets [Line Items]
Lease term	20 years
Number of lease extensions	2
Lease extension term	5 years
Lessee Leasing Arrangements, Capital Leases, Discount Rate						6.30%
Midwest [Member] | Warehouse In Service [Member] | Long-term Debt [Member]
Capital Leased Assets [Line Items]
Capital Lease Obligations, Current		1,000,000		1,000,000		1,000,000
Carrying Value - Capital lease obligations		$ 41,000,000				$ 42,000,000

[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