Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Statement of Financial Position [Abstract] | ||
| Accounts receivable, allowance for doubtful accounts | $ 29,872 | $ 18,322 |
| Preferred stock, par value (USD per share) | $ 0.01 | $ 0.01 |
| Preferred stock, shares authorized (shares) | 20,000,000 | 20,000,000 |
| Preferred stock, shares issued (shares) | 0 | 0 |
| Preferred stock, shares outstanding (in shares) | 0 | 0 |
| Common stock, par value (USD per share) | $ 0.01 | $ 0.01 |
| Common stock, shares authorized (shares) | 300,000,000 | 300,000,000 |
| Common stock, shares issued (in shares) | 48,488,616 | 48,156,990 |
| Common stock, shares outstanding (in shares) | 48,488,616 | 48,156,990 |