Indebtedness - Narrative (Details)				1 Months Ended	2 Months Ended	12 Months Ended
		Jun. 30, 2016	Apr. 14, 2014 USD ($)	Dec. 31, 2002 USD ($) Property	Nov. 30, 2004 USD ($) Property	Dec. 31, 2016 USD ($) lease lender	Dec. 31, 2015 USD ($)		Oct. 15, 2015 USD ($)	Apr. 13, 2014	Jul. 05, 2011 USD ($)
Debt Instruments [Abstract]
Debt						$ 497,829,000	$ 606,746,000	[1]
Less: Current Maturities						146,515,000	156,235,000
Long-Term Debt						351,314,000	450,511,000
Unamortized debt issuance expense						$ 2,900,000
Lease term (in years)						15 years
Sale leaseback transaction, deferred gain, net				$ 0		$ 0
Minimum
Debt Instruments [Abstract]
Lease renewal option term (in years)						1 year
Maximum
Debt Instruments [Abstract]
Lease renewal option term (in years)						20 years
DAMI Credit Facility
Debt Instruments [Abstract]
Debt covenant, senior debt to capital ratio						2
Debt covenant, intercompany dividends as a percentage of acquiree's net income, maximum						0.75
DAMI Credit Facility | Revolving Credit Agreement
Debt Instruments [Abstract]
Debt instrument, covenant compliance percentage		5.00%
Weighted-average borrowing rate (percentage)						5.00%
Amount available for borrowing						$ 7,600,000
DAMI Credit Facility | Revolving Credit Agreement | Minimum
Debt Instruments [Abstract]
Commitment fee for unused balance amount (percentage)						0.50%
DAMI Credit Facility | Revolving Credit Agreement | Maximum
Debt Instruments [Abstract]
Commitment fee for unused balance amount (percentage)						0.75%
DAMI Credit Facility | LIBOR | Revolving Credit Agreement
Debt Instruments [Abstract]
Interest rate basis spread (percentage)						4.375%
Debt instrument basis spread on variable rate						0.25%
Debt instrument, threshold percentage of monthly excess availability						20.00%
Revolving Facility
Debt Instruments [Abstract]
Debt covenant, EBITDA plus lease expense to fixed charges (no less than)						2
Debt covenant, total debt to EBITDA (no greater than)						3
Line of Credit | DAMI Credit Facility | Revolving Credit Agreement
Debt Instruments [Abstract]
Debt	[1]					$ 47,302,000	41,409,000
Line of Credit | Revolving Facility | Revolving Credit Agreement
Debt Instruments [Abstract]
Debt	[1]					0	73,232,000
Line of credit, current borrowing capacity (up to)						225,000,000.0
Line of credit, additional borrowing capacity (up to)						$ 200,000,000.0
Line of credit, additional borrowing capacity, number of lenders | lender						1
Installment payments required						$ 3,100,000.0
Line of credit amount outstanding						$ 225,000,000
Line of Credit | Revolving Facility | Revolving Credit Agreement | Minimum
Debt Instruments [Abstract]
Commitment fee for unused balance amount (percentage)						0.15%
Line of Credit | Revolving Facility | Revolving Credit Agreement | Maximum
Debt Instruments [Abstract]
Commitment fee for unused balance amount (percentage)						0.30%
Line of Credit | Revolving Facility | LIBOR | Revolving Credit Agreement | Minimum
Debt Instruments [Abstract]
Interest rate basis spread (percentage)						1.75%
Line of Credit | Revolving Facility | LIBOR | Revolving Credit Agreement | Maximum
Debt Instruments [Abstract]
Interest rate basis spread (percentage)						2.25%
Weighted-average borrowing rate (percentage)						2.52%
Senior Unsecured Notes Issued July 2011
Debt Instruments [Abstract]
Notes issued											$ 125,000,000
Debt interest rate (percentage)			3.95%							3.75%
Annual principal repayment amount											$ 25,000,000
Senior Notes | Senior Unsecured Notes, 3.95%, Due in Installments through April 2018
Debt Instruments [Abstract]
Debt	[1]					$ 49,975,000	74,956,000
Senior Notes | Senior Unsecured Notes, 4.75%, Due in Installments through April 2021
Debt Instruments [Abstract]
Debt	[1]					299,562,000	299,462,000
Notes issued			$ 300,000,000.0
Debt interest rate (percentage)			4.75%
Periodic payment, principal			$ 60,000,000.0
Term Loan
Debt Instruments [Abstract]
Debt	[1]					$ 94,626,000	108,393,000
Related Party
Debt Instruments [Abstract]
Number of capital leases | lease						19
Properties sold | Property				10	11
Borrowings collateralized by the land and buildings				$ 5,000,000	$ 6,800,000
Lease term (in years)				15 years	15 years
Lease renewal option term (in years)					5 years
Aggregate annual rental				$ 1,200,000	$ 800,000
Interest implicit in the leases (percentage)				10.10%	9.70%
Capital Lease Obligations, Related Party
Debt Instruments [Abstract]
Debt						$ 3,095,000	4,703,000
Capital Lease Obligations
Debt Instruments [Abstract]
Debt						$ 3,269,000	4,591,000
DAMI | Subsidiaries
Debt Instruments [Abstract]
Debt issuance costs, net							(400,000)
DAMI | Subsidiaries | Revolving Credit Agreement
Debt Instruments [Abstract]
Maximum borrowing capacity									$ 85,000,000
DAMI | Subsidiaries | Accordion Facility
Debt Instruments [Abstract]
Maximum borrowing capacity									$ 25,000,000
Debt
Debt Instruments [Abstract]
Debt issuance costs, net							(3,700,000)
Accounting Standards Update 2015-03
Debt Instruments [Abstract]
Debt issuance costs, net							$ 3,700,000

[1] 1 Total debt as of December 31, 2016 includes unamortized debt issuance costs of $2.9 million. The Company retrospectively adopted ASU 2015-03 in the first quarter of 2016, which resulted in the reclassification of unamortized debt issuance costs of $3.7 million from prepaid and other expenses to a direct reduction from debt in the consolidated balance sheet as of December 31, 2015.