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Significant Accounting Policies - Summary of reconciliation of weighted average shares outstanding along with earnings (loss) per share attributable to restricted shares of common stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Schedule Of Earnings Per Share Basic and Diluted By Common Class Including Two Class Method [Line Items] |  |  |
Net income available for stockholders: | $ 166,895 | $ 274,436 | $ 296,381
Less: Dividends paid |  |  |
Undistributed earnings | 79,106 | 160,367 | 249,054
Basic shares outstanding: |  |  |
Basic shares outstanding (in shares) | 215,504 | 215,241 | 217,683
Diluted shares outstanding: |  |  |
Basic shares outstanding (in shares) | 215,504 | 215,241 | 217,683
Diluted shares outstanding (in shares) | 216,733 | 216,796 | 220,250
Basic earnings per share: |  |  |
Basic earnings per share (in dollars per share) | $ 0.77 | $ 1.28 | $ 1.36
Diluted earnings per share: |  |  |
Diluted earnings per share (in dollars per share) | $ 0.77 | $ 1.27 | $ 1.35
Common Stock |  |  |
Less: Dividends paid |  |  |
Dividends | (86,282) | (111,966) | (46,479)
Undistributed earnings | 77,620 | 157,093 | 244,053
Basic shares outstanding: |  |  |
Basic shares outstanding (in shares) | 211,305 | 210,707 | 213,153
Diluted shares outstanding: |  |  |
Basic shares outstanding (in shares) | 211,305 | 210,707 | 213,153
Dilutive effect of stock-based awards (in shares) | 1,229 | 1,555 | 2,567
Diluted shares outstanding (in shares) | 212,534 | 212,262 | 215,720
Basic earnings per share: |  |  |
Distributed earnings (in dollars per share) | $ 0.40 | $ 0.53 | $ 0.22
Undistributed earnings (in dollars per share) | $ 0.37 | $ 0.75 | $ 1.14
Basic earnings per share (in dollars per share) | $ 0.77 | $ 1.28 | $ 1.36
Diluted earnings per share: |  |  |
Distributed earnings (in dollars per share) | $ 0.40 | $ 0.53 | $ 0.22
Undistributed earnings (in dollars per share) | $ 0.37 | $ 0.74 | $ 1.13
Diluted earnings per share (in dollars per share) | $ 0.77 | $ 1.27 | $ 1.35
Restricted shares of common stock |  |  |
Less: Dividends paid |  |  |
Dividends | (1,507) | (2,103) | (848)
Undistributed earnings | $ 1,486 | $ 3,274 | $ 5,001
Basic shares outstanding: |  |  |
Basic shares outstanding (in shares) | 4,199 | 4,534 | 4,530
Diluted shares outstanding: |  |  |
Basic shares outstanding (in shares) | 4,199 | 4,534 | 4,530
Diluted shares outstanding (in shares) | 4,199 | 4,534 | 4,530
Basic earnings per share: |  |  |
Distributed earnings (in dollars per share) | $ 0.36 | $ 0.46 | $ 0.19
Undistributed earnings (in dollars per share) | $ 0.35 | $ 0.72 | $ 1.10
Basic earnings per share (in dollars per share) | $ 0.71 | $ 1.18 | $ 1.29

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