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Accounts Receivable, Notes Receivable, Allowance for Doubtful Accounts and Bad Debt - Modification of Terms (Details) - Notes Receivable $ in Millions | 12 Months Ended
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Dec. 31, 2014 USD ($) customer contract
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Number of customers | customer | 11
Number of notes | contract | 34
Pre-Modification Investment | $ 17.1
Post-Modification Investment | $ 17.1
International |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Number of customers | customer | 11
Number of notes | contract | 34
Pre-Modification Investment | $ 17.1
Post-Modification Investment | $ 17.1
International | Customer One |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Number of customers | customer | 1
Post-Modification Investment | $ 4.0
Number of notes consolidated into one | contract | 12
Contract extension tern | 28 months
International | Customer Two |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Number of customers | customer | 1
Post-Modification Investment | $ 2.3
Contract extension tern | 9 months
International | Customer three |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Number of customers | customer | 1
International | Customer Three, Note One |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Post-Modification Investment | $ 1.4
Number of notes consolidated into one | contract | 4
Contract extension tern | 5 months
International | Customer Three, Note Two |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Post-Modification Investment | $ 0.2
Contract extension tern | 7 months
International | Customer Four |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Number of customers | customer | 1
Post-Modification Investment | $ 3.1
Number of notes consolidated into one | contract | 3
Contract extension tern | 4 months
International | Customer Five |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Number of customers | customer | 1
Post-Modification Investment | $ 0.5
Contract extension tern | 21 months
International | Customer Six |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Number of customers | customer | 1
Post-Modification Investment | $ 0.3
Contract extension tern | 27 months
International | Customer Seven |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Number of customers | customer | 1
Post-Modification Investment | $ 0.1
Contract extension tern | 21 months
International | Customer Eight |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Number of customers | customer | 1
Post-Modification Investment | $ 0.7
Number of notes consolidated into one | contract | 2
Contract extension tern | 15 months
International | Customer Nine |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Number of customers | customer | 1
Post-Modification Investment | $ 0.2
Number of notes consolidated into one | contract | 2
Contract extension tern | 14 months
International | Customer Ten |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Number of customers | customer | 1
Post-Modification Investment | $ 2.5
Number of notes consolidated into one | contract | 5
Contract extension tern | 24 months
International | Customer Eleven |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Number of customers | customer | 1
Post-Modification Investment | $ 1.8
Contract extension tern | 34 months

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