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Noncontrolling Interests (Redeemable Preferred Units) (Narrative) (Details) $ / shares in Units, $ in Millions |  |  | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 25, 2015 USD ($) $ / shares shares | May. 12, 2014 $ / shares shares | Dec. 31, 2014 shares | Dec. 31, 2013 shares | May. 15, 2015 $ / shares | Feb. 17, 2015 $ / shares | Nov. 05, 2014 USD ($) | Oct. 16, 2014 shares | Jul. 03, 2014 USD ($) | May. 19, 2014 shares | Aug. 29, 2013 d shares
Series Two Preferred Units [Member] |  |  |  |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |  |  |  |
Units converted (in shares) |  |  | 666,116 | 329,881 |  |  |  |  |  |  |
Series Two Preferred Units [Member] | Noncontrolling Interests [Member] |  |  |  |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |  |  |  |
Liquidation preference percentage |  | 6.00% |  |  |  |  |  |  |  |  |
Operating Units liquidation preference (in dollars per share) | $ / shares |  | $ 38.10 |  |  |  |  |  |  |  |  |
OP Units for each Preferred Unit (in shares) |  | 1.312336 |  |  |  |  |  |  |  |  |
Units converted (in shares) |  | 666,116 |  | 329,881 |  |  |  |  |  |  |
Series Two Preferred Units On Converted Basis |  | 874,168 |  | 432,914 |  |  |  |  |  |  |
Preferred Units Liquidation Preference | $ / shares |  | $ 50.00 |  |  |  |  |  |  |  |  |
Series Four Preferred Units [Member] | Noncontrolling Interests [Member] |  |  |  |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |  |  |  |
Series Four Preferred Units Redeemed | 12,667 |  |  |  |  |  |  |  |  |  | 861,400
Series Four Preferred Units Released from Escrow |  |  |  |  |  |  |  | 27,773 |  | 319,687 |
Redemption of Series Four Preferred Units | $ | $ 0.6 |  |  |  |  |  | $ 1.4 |  | $ 16.0 |  |
Distributions to Series Two and Four Preferred Units (in dollars per share) | $ / shares |  |  |  |  | $ 0.25 | $ 0.25 |  |  |  |  |
Series Four Preferred Units Annual Dividend Payable Rate | 2.00% |  |  |  |  |  |  |  |  |  |
Preferred Units Liquidation Preference | $ / shares | $ 50.00 |  |  |  |  |  |  |  |  |  |
First opportunity to redeem Series Four Preferred Units (in days) | d |  |  |  |  |  |  |  |  |  |  | 30
OP Units [Member] |  |  |  |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |  |  |  |
Units converted (in shares) |  |  | 874,168 | 432,914 |  |  |  |  |  |  |

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