|
Accrued Expenses and Other Current Liabilities (Details) (USD $)
In Thousands, unless otherwise specified |
Mar. 31, 2015
|
Dec. 31, 2014
|
|---|---|---|
| Payables and Accruals [Abstract] | ||
| Payroll and employee benefits | $ 49,039 | $ 73,362 |
| Taxes other than income taxes | 111,362 | 114,598 |
| Interest | 77,375 | 30,384 |
| Acquired sales contracts | 11,635 | 12,453 |
| Workers’ compensation | 15,586 | 16,714 |
| Asset retirement obligations | 19,215 | 19,222 |
| Other | 37,291 | 35,663 |
| Accrued Liabilities, Current | $ 321,503 | $ 302,396 |