Summary of Significant Accounting Policies (Narrative) (Details) shares in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($) state shares	Jun. 30, 2016 USD ($) shares	Jun. 30, 2017 USD ($) state segment item shares	Jun. 30, 2016 USD ($) 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			110
Number of states in which the company operates | state	24		24
Goodwill impairment charge	$ 0	$ 0	$ 0	$ 0	$ 0
Impairment of finite-lived intangible assets	0	0	0	0
Impairment of intangible assets, indefinite-lived (Excluding Goodwill)	0	0	0	0
Deductible component of workers' compensation			400,000
Increase in workers' compensation liabilities			500,000		$ 700,000
Interest income received	0	0	0	0
Income tax expense (benefit)	1,170,000	$ 1,131,000	$ 3,285,000	$ 1,207,000
Number of stock incentive plans | item			2
Accounting Standards Update 2016-09 [Member]
Summary Of Significant Accounting Policies [Line Items]
Income tax expense (benefit)	$ 92,000		$ 118,000
Stock Options [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of stock options included in calculation | shares	461	469	461	469
Number of dilutive shares outstanding | shares	105	24	101	25
Restricted Stock [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of dilutive shares outstanding | shares	47	0	51	0
Shares of restricted stock awards included in calculation | shares	139	98	139	98
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