Property and equipment (Details) - USD ($) $ in Thousands |
Jun. 30, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Property and equipment | ||
| Total property and equipment | $ 255,492 | $ 198,764 |
| Less: accumulated depreciation and amortization | (103,486) | (86,992) |
| Total property and equipment, net | 152,006 | 111,772 |
| Leasehold improvements | ||
| Property and equipment | ||
| Total property and equipment | 179,401 | 152,627 |
| Construction in progress | ||
| Property and equipment | ||
| Total property and equipment | 42,814 | 20,104 |
| Computer equipment | ||
| Property and equipment | ||
| Total property and equipment | 10,698 | 7,909 |
| Software | ||
| Property and equipment | ||
| Total property and equipment | 20,840 | 17,827 |
| Office equipment | ||
| Property and equipment | ||
| Total property and equipment | $ 1,739 | $ 297 |