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Consolidated Statements of Stockholders' Equity (USD $) | Total | Series C Preferred Stock | Series D Preferred Stock | Series E Preferred Stock | Total Stockholders’ Equity | Total Stockholders’ Equity Series C Preferred Stock | Total Stockholders’ Equity Series D Preferred Stock | Total Stockholders’ Equity Series E Preferred Stock | Preferred Stock Series C Preferred Stock | Preferred Stock Series D Preferred Stock | Preferred Stock Series E Preferred Stock | Common Stock | Common Stock Series C Preferred Stock | Common Stock Series D Preferred Stock | Common Stock Series E Preferred Stock | Capital in Excess of Par Value | Capital in Excess of Par Value Series C Preferred Stock | Capital in Excess of Par Value Series D Preferred Stock | Capital in Excess of Par Value Series E Preferred Stock | Retained Earnings | Retained Earnings Series C Preferred Stock | Retained Earnings Series D Preferred Stock | Retained Earnings Series E Preferred Stock | Accumulated Other Comprehensive Income | Accumulated Other Comprehensive Income Series C Preferred Stock | Accumulated Other Comprehensive Income Series D Preferred Stock | Accumulated Other Comprehensive Income Series E Preferred Stock | Noncontrolling Interests | Noncontrolling Interests Series C Preferred Stock | Noncontrolling Interests Series D Preferred Stock | Noncontrolling Interests Series E Preferred Stock
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Balances at Dec. 31, 2010 | $ 1,528,774,000 |  |  |  | $ 1,527,483,000 |  |  |  | $ 92,000,000 |  |  | $ 838,000 |  |  |  | $ 1,429,750,000 |  |  |  | $ 3,234,000 |  |  |  | $ 1,661,000 |  |  |  | $ 1,291,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings | 92,416,000 |  |  |  | 92,325,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 92,325,000 |  |  |  |  |  |  |  | 91,000 |  |  |
Dividends declared and paid: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends declared and paid |  | (6,785,000) |  |  |  | (6,785,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (6,785,000) |  |  |  |  |  |  |  |  |  |
Common stock dividends declared and paid | (120,063,000) |  |  |  | (120,063,000) |  |  |  |  |  |  | 5,000 |  |  |  | 13,652,000 |  |  |  | (133,720,000) |  |  |  |  |  |  |  |  |  |  |
Redemption of 3,680,000 shares of Series C Preferred Stock | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of stock | 447,863,000 |  |  |  | 447,863,000 |  |  |  |  |  |  | 173,000 |  |  |  | 447,690,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock - stock purchase program | 79,794,000 |  |  |  | 79,794,000 |  |  |  |  |  |  | 32,000 |  |  |  | 79,762,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares of restricted common stock | (56,000) |  |  |  | (56,000) |  |  |  |  |  |  | 1,000 |  |  |  | (57,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance costs | (19,453,000) |  |  |  | (19,453,000) |  |  |  |  |  |  |  |  |  |  | (19,453,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance incentive plan | (513,000) |  |  |  | (513,000) |  |  |  |  |  |  |  |  |  |  | (513,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred compensation | 7,394,000 |  |  |  | 7,394,000 |  |  |  |  |  |  |  |  |  |  | 7,394,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of interest rate hedges | 9,000 |  |  |  | 9,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,000 |  |  |  |  |  |  |
Fair value treasury locks | (5,218,000) |  |  |  | (5,218,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,218,000) |  |  |  |  |  |  |
Unrealized loss – commercial mortgage residual interests | (246,000) |  |  |  | (246,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (246,000) |  |  |  |  |  |  |
Stock value adjustments | (36,000) |  |  |  | (36,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (36,000) |  |  |  |  |  |  |
Contributions from noncontrolling interests | 41,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 41,000 |  |  |
Distributions to noncontrolling interests | (45,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (45,000) |  |  |
Balances at Dec. 31, 2011 | 2,003,876,000 |  |  |  | 2,002,498,000 |  |  |  | 92,000,000 |  |  | 1,049,000 |  |  |  | 1,958,225,000 |  |  |  | (44,946,000) |  |  |  | (3,830,000) |  |  |  | 1,378,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings | 141,937,000 |  |  |  | 142,015,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 142,015,000 |  |  |  |  |  |  |  | (78,000) |  |  |
Dividends declared and paid: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends declared and paid |  | (1,979,000) | (15,449,000) |  |  | (1,979,000) | (15,449,000) |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,979,000) | (15,449,000) |  |  |  |  |  |  |  |  |
Common stock dividends declared and paid | (155,733,000) |  |  |  | (155,733,000) |  |  |  |  |  |  | 4,000 |  |  |  | 11,758,000 |  |  |  | (167,495,000) |  |  |  |  |  |  |  |  |  |  |
Redemption of 3,680,000 shares of Series C Preferred Stock | (3,098,000) | (92,000,000) |  |  |  | (92,000,000) |  |  | (92,000,000) |  |  |  |  |  |  |  | 3,098,000 |  |  |  | (3,098,000) |  |  |  |  |  |  |  |  |  |
Issuance of stock | 833,000 |  | 277,645,000 |  | 833,000 |  | 277,645,000 |  |  | 287,500,000 |  |  |  |  |  | 833,000 |  | (9,855,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock - stock purchase program | 44,412,000 |  |  |  | 44,412,000 |  |  |  |  |  |  | 17,000 |  |  |  | 44,395,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock - ATM equity program | 129,092,000 |  |  |  | 129,092,000 |  |  |  |  |  |  | 43,000 |  |  |  | 129,049,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares of restricted common stock | 335,000 |  |  |  | 335,000 |  |  |  |  |  |  | 4,000 |  |  |  | 331,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity component of convertible debt | (41,486,000) |  |  |  | (41,486,000) |  |  |  |  |  |  |  |  |  |  | (41,486,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance costs | (2,265,000) |  |  |  | (2,265,000) |  |  |  |  |  |  |  |  |  |  | (2,265,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance incentive plan | (451,000) |  |  |  | (451,000) |  |  |  |  |  |  |  |  |  |  | (451,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred compensation | 7,370,000 |  |  |  | 7,370,000 |  |  |  |  |  |  |  |  |  |  | 7,370,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of interest rate hedges | 231,000 |  |  |  | 231,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 231,000 |  |  |  |  |  |  |
Fair value treasury locks | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized loss – commercial mortgage residual interests | 1,132,000 |  |  |  | 1,132,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,132,000 |  |  |  |  |  |  |
Stock value adjustments | 85,000 |  |  |  | 85,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85,000 |  |  |  |  |  |  |
Balances at Dec. 31, 2012 | 2,297,585,000 |  |  |  | 2,296,285,000 |  |  |  |  | 287,500,000 |  | 1,117,000 |  |  |  | 2,101,002,000 |  |  |  | (90,952,000) |  |  |  | (2,382,000) |  |  |  | 1,300,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings | 160,085,000 |  |  |  | 160,145,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 160,145,000 |  |  |  |  |  |  |  | (60,000) |  |  |
Dividends declared and paid: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends declared and paid | (8,876,000) |  | (19,047,000) |  | (8,876,000) |  | (19,047,000) |  |  |  |  |  |  |  |  |  |  |  |  | (8,876,000) |  | (19,047,000) |  |  |  |  |  |  |  |  |
Common stock dividends declared and paid | (174,162,000) |  |  |  | (174,162,000) |  |  |  |  |  |  | 4,000 |  |  |  | 14,941,000 |  |  |  | (189,107,000) |  |  |  |  |  |  |  |  |  |  |
Redemption of 3,680,000 shares of Series C Preferred Stock | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of stock | 744,000 |  |  | 277,644,000 | 744,000 |  |  | 277,644,000 |  |  | 287,500,000 |  |  |  |  | 744,000 |  |  | (9,856,000) |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock - stock purchase program | 10,461,000 |  |  |  | 10,461,000 |  |  |  |  |  |  | 3,000 |  |  |  | 10,458,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock - ATM equity program | 242,418,000 |  |  |  | 242,418,000 |  |  |  |  |  |  | 70,000 |  |  |  | 242,348,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock - conversion of 2028 Notes | 85,224,000 |  |  |  | 85,224,000 |  |  |  |  |  |  | 24,000 |  |  |  | 85,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares of restricted common stock | (210,000) |  |  |  | (210,000) |  |  |  |  |  |  | 3,000 |  |  |  | (213,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity component of convertible debt | (93,450,000) |  |  |  | (93,450,000) |  |  |  |  |  |  |  |  |  |  | (93,450,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance costs | (3,774,000) |  |  |  | (3,774,000) |  |  |  |  |  |  |  |  |  |  | (3,774,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred compensation | 6,715,000 |  |  |  | 6,715,000 |  |  |  |  |  |  |  |  |  |  | 6,715,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of interest rate hedges | 438,000 |  |  |  | 438,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 438,000 |  |  |  |  |  |  |
Fair value treasury locks | (3,141,000) |  |  |  | (3,141,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,141,000) |  |  |  |  |  |  |
Unrealized loss – commercial mortgage residual interests | (438,000) |  |  |  | (438,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (438,000) |  |  |  |  |  |  |
Stock value adjustments | 69,000 |  |  |  | 69,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 69,000 |  |  |  |  |  |  |
Noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (949,000) |  |  |  |  |  |  |  | 949,000 |  |  |  |  |  |  |
Balances at Dec. 31, 2013 | $ 2,778,285,000 |  |  |  | $ 2,777,045,000 |  |  |  |  | $ 287,500,000 | $ 287,500,000 | $ 1,221,000 |  |  |  | $ 2,353,166,000 |  |  |  | $ (147,837,000) |  |  |  | $ (4,505,000) |  |  |  | $ 1,240,000 |  |  |

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