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Summary of Significant Accounting Policies (Details)	3 Months Ended	12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2016 USD ($) item	Dec. 31, 2015 USD ($)	Sep. 30, 2014 USD ($)
Significant Accounting Policies
Number of states in which the Company operates | item		48
Depreciation	$ 9,736,000	$ 44,283,000	$ 47,072,000	$ 40,168,000
Impairment of long-lived assets	$ 0	$ 0	$ 0	$ 0
Federal statutory effective income tax rate	35.00%	35.00%	35.00%	35.00%
Impairment of Intangible Assets		$ 0	$ 0
Change in estimated life of certain recording equipment assets
Significant Accounting Policies
Depreciation		$ 1,300,000

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Significant Accounting Policies [Line Items]

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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The number of states the entity operates in as of the balance sheet date.

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