Significant Accounting and Reporting Policies-Receivables (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Allowance for Doubtful Accounts Receivable [Roll Forward] | |||
| Allowance for doubtful accounts, beginning of period | $ 10,960 | $ 10,234 | $ 10,584 |
| Provision for bad debt expense | 1,432 | 2,117 | 1,396 |
| Write-offs, net of recoveries | (684) | (812) | (2,112) |
| Currency translation and other changes | (868) | (579) | 366 |
| Adjustments for business acquisitions and dispositions | 2,293 | 0 | 0 |
| Allowance for doubtful accounts, end of period | 13,133 | 10,960 | 10,234 |
| Sales allowances, services | $ 2,704 | $ 1,786 | $ 2,812 |