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Divestiture (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Business Combinations [Abstract] |  |  |  |
Revenues |  | $ 144,962 |  | $ 277,368
Cost and expenses |  | 144,672 |  | 276,936
Operating income |  | 290 |  | 432
Interest income |  | 0 |  | 1
Income from discontinued operations | $ 0 | $ 290 | $ 0 | $ 433

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