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Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 1 Months Ended | 3 Months Ended | 4 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | May 10, 2013 At The Market Stock Issues [Member] | Mar. 31, 2013 At The Market Stock Issues [Member] | May 10, 2013 At The Market Stock Issues [Member] | Mar. 01, 2013 At The Market Stock Issues [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  | 0 |  |  |  |
Denominator - basic (in shares) | 161,540,000 | 148,495,000 |  |  |  |
Deemed shares related to deferred compensation arrangements (in shares) | 0 | 43,000 |  |  |  |
Denominator - diluted (in shares) | 161,540,000 | 148,538,000 |  |  |  |
Class of Stock Disclosures [Abstract] |  |  |  |  |  |
Common Stock Offering, Maximum Aggregate Price |  |  | $ 227,774 |  | $ 227,774 | $ 300,000
Commission To Sales Agent, Percent |  |  |  |  |  | 2.00%
Stock Issued During Period Shares New Issues Including Shares Settled Subsequent To The End Of Period |  |  |  | 2,668,438 |  |
Common Stock, Shares, Issued |  |  | 394,000 | 1,899,105 | 3,062,438 |
Proceeds From Issuance Of Common Stock, Price Per Share, Weighted Average |  |  | $ 23.59 | $ 23.58 | $ 23.59 |
Proceeds From Issuance Of Common Stock Gross Including Subsequent Settlements |  |  |  | 62,933 |  |
Stock Issued During Period Value New Issues Including Subsequent Settlements |  |  |  | 62,146 |  |
Proceeds From Issuance Of Common Stock, Gross |  |  | 9,293 | 44,459 |  |
Issuance of common stock | $ 43,869 |  | $ 9,177 | $ 43,904 |  |

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