|
Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified |
Mar. 31, 2015
|
Dec. 31, 2014
|
|---|---|---|
| Statement of Financial Position [Abstract] | ||
| Accounts receivable, allowance for doubtful accounts | $ 5,571 | $ 4,867 |
| Property and equipment, accumulated depreciation | 161,038 | 144,220 |
| Other intangible assets, accumulated amortization | $ 611,562 | $ 574,503 |
| Common stock issued (in shares) | 208,012,259 | 207,493,541 |
| Common stock outstanding (in shares) | 208,012,259 | 207,493,541 |