Company Information and Significant Accounting Policies Schedule of Error Corrections and Prior Period Adjustments (Details) (USD $)
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9 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | ||||||||||
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Sep. 30, 2013
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Sep. 30, 2012
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Mar. 31, 2013
As Previously Reported [Member]
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Mar. 31, 2012
As Previously Reported [Member]
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Jun. 30, 2012
As Previously Reported [Member]
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Sep. 30, 2012
As Previously Reported [Member]
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Dec. 31, 2012
As Previously Reported [Member]
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Dec. 31, 2011
As Previously Reported [Member]
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Dec. 31, 2010
As Previously Reported [Member]
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Mar. 31, 2013
Adjustment [Member]
|
Mar. 31, 2012
Adjustment [Member]
|
Jun. 30, 2012
Adjustment [Member]
|
Sep. 30, 2012
Adjustment [Member]
|
Dec. 31, 2012
Adjustment [Member]
|
Dec. 31, 2011
Adjustment [Member]
|
Dec. 31, 2010
Adjustment [Member]
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Mar. 31, 2013
As Revised [Member]
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Mar. 31, 2012
As Revised [Member]
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Jun. 30, 2012
As Revised [Member]
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Sep. 30, 2012
As Revised [Member]
|
Dec. 31, 2012
As Revised [Member]
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Dec. 31, 2011
As Revised [Member]
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Dec. 31, 2010
As Revised [Member]
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Forgivable notes receivable, net | $ (5,722,000) | $ (2,853,000) | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ (1,729,000) | $ (475,000) | $ (1,537,000) | $ (2,853,000) | $ (10,898,000) | $ (3,475,000) | $ (1,120,000) | $ (1,729,000) | $ (475,000) | $ (1,537,000) | $ (2,853,000) | $ (10,898,000) | $ (3,475,000) | $ (1,120,000) |
Net cash provided (used) by operating activities | 105,009,000 | 118,423,000 | 1,874,000 | 4,412,000 | 37,802,000 | 121,276,000 | 161,020,000 | 134,844,000 | 144,935,000 | (1,729,000) | (475,000) | (1,537,000) | (2,853,000) | (10,898,000) | (3,475,000) | (1,120,000) | 145,000 | 3,937,000 | 36,265,000 | 118,423,000 | 150,122,000 | 131,369,000 | 143,815,000 |
Issuance of mezzanine and other notes receivable | 0 | (4,236,000) | (1,729,000) | (3,719,000) | (5,820,000) | (7,305,000) | (34,925,000) | (12,766,000) | (11,786,000) | 1,729,000 | 583,000 | 1,684,000 | 3,069,000 | 11,189,000 | 3,539,000 | 1,203,000 | 0 | (3,136,000) | (4,136,000) | (4,236,000) | (23,736,000) | (9,227,000) | (10,583,000) |
Collections of mezzanine and other notes receivable | 224,000 | 110,000 | 19,000 | 151,000 | 210,000 | 326,000 | 3,561,000 | 4,754,000 | 5,083,000 | 0 | (108,000) | (147,000) | (216,000) | (291,000) | (64,000) | (83,000) | 19,000 | 43,000 | 63,000 | 110,000 | 3,270,000 | 4,690,000 | 5,000,000 |
Net cash provided (used) in investing activities | $ 28,350,000 | $ 16,709,000 | $ (13,816,000) | $ (1,496,000) | $ (10,387,000) | $ (19,562,000) | $ (57,999,000) | $ (23,804,000) | $ (32,155,000) | $ 1,729,000 | $ 475,000 | $ 1,537,000 | $ 2,853,000 | $ 10,898,000 | $ 3,475,000 | $ 1,120,000 | $ (12,087,000) | $ (1,021,000) | $ (8,850,000) | $ (16,709,000) | $ (47,101,000) | $ (20,329,000) | $ (31,035,000) |