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Quarterly Financial Information (Unaudited) (Details) - Selected Quarterly Financial Data (USD $)
In Thousands, except Per Share data, unless otherwise specified |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2014
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Sep. 30, 2014
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Jun. 30, 2014
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Mar. 31, 2014
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Selected Quarterly Financial Data [Abstract] | |||||||||||
| Total revenue | $ 82,152 | $ 81,306 | $ 78,896 | $ 72,657 | $ 68,756 | $ 65,500 | $ 59,215 | $ 52,171 | $ 315,011 | $ 245,642 | $ 155,799 |
| Operating income (loss) | 15,902 | (4,734) | (18,223) | (3,307) | 3,271 | (13,028) | (13,855) | (7,469) | (10,362) | (31,081) | (51,033) |
| Net income (loss) | $ 15,272 | $ (5,207) | $ (18,356) | $ (3,783) | $ 2,803 | $ (13,511) | $ (14,334) | $ (7,947) | $ (12,074) | $ (32,989) | $ (52,894) |
| Net loss per common share — basic and diluted (USD per share) | $ 0.26 | $ (0.09) | $ (0.31) | $ (0.06) | $ 0.05 | $ (0.23) | $ (0.25) | $ (0.14) | $ (0.21) | $ (0.57) | $ (0.92) |