Quarterly Financial Information (Unaudited) - Narrative (Details) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2015 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($) store	Mar. 31, 2014 USD ($) proxy	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($) store	Dec. 31, 2013 USD ($)
Quarterly Financial Information Disclosure [Abstract]
Financial advisory and legal costs		$ 385	$ 12,400	$ 872	$ 0	$ 13,661	$ 0
Number of proxy contests | proxy				2
Impairment of leasehold improvement			$ 2,300
Number of store closures | store			44			44
Restructuring Expenses		6,900			0	$ 9,140	0
Retirement and vacation charges		9,100			0	9,094	4,917
Regulatory expense (income)		(1,200)
Business Acquisition [Line Items]
Acquisition related costs		$ 371	$ 5,500	$ 803	0	$ 6,638	$ 0
DAMI | Subsidiaries
Business Acquisition [Line Items]
Acquisition related costs	$ 2,700				$ 3,700