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Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets and Liabilities - Finite-Lived Intangible Assets and Liabilities Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets
Goodwill and Intangible Asset Impairment		$ 3,011
Customer Relationships | Minimum
Finite-Lived Intangible Assets
Amortization period	10 years
Customer Relationships | Maximum
Finite-Lived Intangible Assets
Amortization period	30 years
Customer inducements | Minimum
Finite-Lived Intangible Assets
Amortization period	10 years
Customer inducements | Maximum
Finite-Lived Intangible Assets
Amortization period	30 years
Customer Inducements, Current Record Management Vendor Or Payments To Customers [Member] | Minimum
Finite-Lived Intangible Assets
Amortization period	5 years
Customer Inducements, Current Record Management Vendor Or Payments To Customers [Member] | Maximum
Finite-Lived Intangible Assets
Amortization period	15 years

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Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

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