Segment Reporting - Reconciliation of Income (Details) (USD $)
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3 Months Ended | 12 Months Ended | |||||||||
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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, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Segment Reporting [Abstract] | |||||||||||
Net operating income | $ 117,975,000 | $ 85,522,000 | $ 68,965,000 | ||||||||
General and administrative | (19,952,000) | (16,497,000) | (13,038,000) | ||||||||
Depreciation and amortization | (70,063,000) | (54,758,000) | (41,983,000) | ||||||||
Interest expense | (25,470,000) | (19,071,000) | (17,480,000) | ||||||||
Interest income | 272,000 | 306,000 | 73,000 | ||||||||
Acquisition-related expenses | (1,446,000) | (1,051,000) | (1,693,000) | ||||||||
Other expense | 99,000 | 92,000 | (443,000) | ||||||||
Income (loss) from continuing operations | 10,407,000 | 5,170,000 | 7,314,000 | 3,668,000 | 2,176,000 | 4,530,000 | 2,405,000 | 5,203,000 | 1,415,000 | (5,457,000) | (5,599,000) |
Intersegment sales | 0 | 0 | |||||||||
Intersegment transfers | $ 0 | $ 0 |