| Schedule of Error Corrections and Prior Period Adjustments [Table Text Block] |
| | Three Months | | | Ended | | Description | | March 31, 2017 | | | (amounts in thousands) (unaudited) | | | | Net revenues: | | | | | Prior to revision | | $ | 97,452 | | Revision | | | 1,549 | | As revised | | $ | 99,001 | | | | | | Station operating expenses, including | | | | | non-cash compensation expense: | | | | | Prior to revision | | $ | 75,617 | | Revision | | | 1,549 | | As revised | | $ | 77,166 |
| | Three Months Ended (unaudited) | | Year Ended | | | March 31, | | June 30, | | September 30, | | December 31, | | December 31, | | Description | | 2016 | | | (amounts in thousands) | | Net revenues: | | | | | | | | | | | | | | | | | Prior to revision | | $ | 96,103 | | $ | 120,478 | | $ | 120,457 | | $ | 123,207 | | $ | 460,245 | | Revision | | | 906 | | | 1,093 | | | 1,184 | | | 1,343 | | | 4,526 | | As revised | | $ | 97,009 | | $ | 121,571 | | $ | 121,641 | | $ | 124,550 | | $ | 464,771 | | | | | | | | | | | | | | | | | | Station operating expenses, including | | | | | | | | | | | | | | | | | non-cash compensation expense: | | | | | | | | | | | | | | | | | Prior to revision | | $ | 71,715 | | $ | 82,639 | | $ | 82,905 | | $ | 81,485 | | $ | 318,744 | | Revision | | | 906 | | | 1,093 | | | 1,184 | | | 1,343 | | | 4,526 | | As revised | | $ | 72,621 | | $ | 83,732 | | $ | 84,089 | | $ | 82,828 | | $ | 323,270 |
| | Three Months Ended (unaudited) | | Year Ended | | | March 31, | | June 30, | | September 30, | | December 31, | | December 31, | | Description | | 2015 | | | (amounts in thousands) | | Net Revenues: | | | | | | | | | | | | | | | | | Prior to revision | | $ | 78,420 | | $ | 100,592 | | $ | 114,662 | | $ | 117,704 | | $ | 411,378 | | Revision | | | 589 | | | 730 | | | 874 | | | 910 | | | 3,103 | | As revised | | $ | 79,009 | | $ | 101,322 | | $ | 115,536 | | $ | 118,614 | | $ | 414,481 | | | | | | | | | | | | | | | | | | Station operating expenses, including | | | | | | | | | | | | | | | | | non-cash compensation expense: | | | | | | | | | | | | | | | | | Prior to revision | | $ | 59,367 | | $ | 70,000 | | $ | 81,241 | | $ | 77,103 | | $ | 287,711 | | Revision | | | 589 | | | 730 | | | 874 | | | 910 | | | 3,103 | | As revised | | $ | 59,956 | | $ | 70,730 | | $ | 82,115 | | $ | 78,013 | | $ | 290,814 |
|