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Share-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
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Oct. 31, 2007 CALLC Pre Split entity | May 31, 2011 CALLC -Post Split | Feb. 28, 2011 CALLC -Post Split | Feb. 28, 2011 CALLC II | Jun. 30, 2011 CALLC, CALLC II and CALLC III | Jun. 30, 2011 CALLC, CALLC II and CALLC III | Jun. 30, 2005 Override Value Units (a) CALLC, CALLC II and CALLC III | Jun. 30, 2011 Override Value Units (a) CALLC, CALLC II and CALLC III | Jun. 30, 2011 Override Value Units (a) CALLC, CALLC II and CALLC III | Jun. 30, 2012 Override Value Units (a) CALLC, CALLC II and CALLC III | Dec. 31, 2006 Override Value Units (b) CALLC, CALLC II and CALLC III | Jun. 30, 2011 Override Value Units (b) CALLC, CALLC II and CALLC III | Jun. 30, 2011 Override Value Units (b) CALLC, CALLC II and CALLC III | Jun. 30, 2012 Override Value Units (b) CALLC, CALLC II and CALLC III | Feb. 29, 2008 Override Units (c) CALLC, CALLC II and CALLC III | Jun. 30, 2011 Override Units (c) CALLC, CALLC II and CALLC III | Jun. 30, 2011 Override Units (c) CALLC, CALLC II and CALLC III | Jun. 30, 2012 Override Units (c) CALLC, CALLC II and CALLC III
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of entities into which the limited liability company was split | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares of common stock sold pursuant to a registered public offering |  | 7,988,179 | 11,759,023 | 15,113,254 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Key information for the share-based compensation plans related to the override units of CALLC, CALLC II and CALLC III |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Benchmark Value (per unit) |  |  |  |  |  |  |  |  |  | $ 11.31 |  |  |  | $ 34.72 |  |  |  | $ 10.00
Original Award Issued (in shares) |  |  |  |  |  |  | 1,839,265 |  |  |  | 144,966 |  |  |  | 642,219 |  |  |
Compensation Expense Increase (Decrease) |  |  |  |  | $ (42) | $ 5,595 |  | $ (27) | $ 4,960 |  |  | $ (64) | $ 451 |  |  | $ 49 | $ 184 |

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