Summary of Significant Accounting Policies (Narrative) (Details) shares in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017 USD ($) state segment item shares	Mar. 31, 2016 USD ($) shares	Dec. 31, 2016 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of reportable business segments | segment	1
Number of consumers | item	34,000
Number of locations | item	111
Number of states in which the company operates | state	24
Goodwill impairment charge	$ 0	$ 0	$ 0
Impairment of finite-lived intangible assets	0	0
Impairment of intangible assets, indefinite-lived (Excluding Goodwill)	0	0
Deductible component of workers' compensation	400,000
Interest income received	0	0
Income tax expense (benefit)	$ 2,115,000	$ 77,000
Number of stock incentive plans | item	1
Accounting Standards Update 2016-09 [Member]
Summary Of Significant Accounting Policies [Line Items]
Income tax expense (benefit)	$ 26,300
Stock Options [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of stock options included in calculation | shares	470	758
Number of dilutive shares outstanding | shares	96	131
Restricted Stock [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of dilutive shares outstanding | shares	50	24
Shares of restricted stock awards included in calculation | shares	143	102
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Intangible assets, estimated useful lives	2 years
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Intangible assets, estimated useful lives	25 years