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Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2017
Valuation And Qualifying Accounts [Abstract] |
Valuation and Qualifying Accounts | Schedule II Valuation and Qualifying Accounts (dollars in thousands)
Description |  | Balance, Beginning of Period |  |  | Additions/Charges to Expense |  |  | Deductions/ Other |  |  | Balance, End of Period |
Valuation allowance for deferred tax assets (1): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
For the year ended December 31, 2017 |  | $ | 49,748 |  |  | $ | 2,146 |  |  | $ | (1,375 | ) |  | $ | 50,519 |
For the year ended December 31, 2016 |  | $ | 47,545 |  |  | $ | 4,219 |  |  | $ | (2,016 | ) |  | $ | 49,748 |
For the year ended December 31, 2015 |  | $ | 150,384 |  |  | $ | (109,805 | ) |  | $ | 6,966 |  |  | $ | 47,545 |
Valuation allowance for accounts receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
For the year ended December 31, 2017 |  | $ | 23,142 |  |  | $ | 27,571 |  |  | $ | (28,179 | ) |  | $ | 22,534 |
For the year ended December 31, 2016 |  | $ | 20,229 |  |  | $ | 32,049 |  |  | $ | (29,136 | ) |  | $ | 23,142 |
For the year ended December 31, 2015 |  | $ | 19,097 |  |  | $ | 22,212 |  |  | $ | (21,080 | ) |  | $ | 20,229 |
(1) | Amounts include both continuing and discontinued operations gross deferred tax balances.

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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- References No definition available. + Details
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