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Segment Reporting - Reconciliation of Income (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
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