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Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 10, 2015 | Jul. 30, 2015 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common Stock, Authorized |  |  |  | 450,000,000 |  | 450,000,000 |  | 450,000,000
Common Stock, Par Value |  |  |  | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01
Common Stock, Issued |  |  |  | 137,467,243 |  | 137,467,243 |  | 136,624,157
Common Stock, Outstanding |  |  |  | 137,467,243 |  | 137,467,243 |  | 136,624,157
Preferred Stock, Shares Authorized |  |  |  | 50,000,000 |  | 50,000,000 |  |
Preferred Stock, Par or Stated Value Per Share |  |  |  | $ 0.01 |  | $ 0.01 |  |
Preferred Stock, Shares Issued |  |  |  | 0 |  | 0 |  |
Preferred Stock, Shares Outstanding |  |  |  | 0 |  | 0 |  |
Issuance of stock for purchases of property and equipment (shares) |  |  |  |  |  | 346,554 |  |
Issuance of stock for purchase of property and equipment |  |  |  |  |  | $ 9.8 |  |
Dividends declared per common share (in dollars per share) |  |  |  | $ 0.34 | $ 0.37 | $ 0.74 | $ 0.37 |
Subsequent Event |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Dividends Payable, Date Declared |  |  | Jul. 30, 2015 |  |  |  |  |
Dividends declared per common share (in dollars per share) |  |  | $ 0.34 |  |  |  |  |
Dividends Payable, Date to be Paid | Sep. 30, 2015 |  |  |  |  |  |  |
Dividends Payable, Date of Record |  | Sep. 10, 2015 |  |  |  |  |  |
Additional Paid-In Capital |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Issuance of stock for purchase of property and equipment |  |  |  |  |  | $ 9.8 |  |

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