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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, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Schedule Of Earnings Per Share Basic and Diluted By Common Class Including Two Class Method [Line Items] |  |  |
Net income available for stockholders: | $ 274,436 | $ 296,381 | $ 146,742
Less: Dividends paid |  |  |
Undistributed earnings | 160,367 | 249,054 | 126,095
Basic shares outstanding : |  |  |
Basic shares outstanding (in shares) | 215,241 | 217,683 | 217,484
Diluted shares outstanding : |  |  |
Basic shares outstanding (in shares) | 215,241 | 217,683 | 217,484
Diluted shares outstanding (in shares) | 216,796 | 220,250 | 219,805
Basic earnings per share: |  |  |
Basic earnings per share (in dollars per share) | $ 1.28 | $ 1.36 | $ 0.67
Diluted earnings per share: |  |  |
Diluted earnings per share (in dollars per share) | $ 1.27 | $ 1.35 | $ 0.67
Common Stock |  |  |
Less: Dividends paid |  |  |
Dividends | (111,966) | (46,479) | (20,294)
Undistributed earnings | 157,093 | 244,053 | 123,536
Basic shares outstanding : |  |  |
Basic shares outstanding (in shares) | 210,707 | 213,153 | 212,799
Diluted shares outstanding : |  |  |
Basic shares outstanding (in shares) | 210,707 | 213,153 | 212,799
Dilutive effect of stock-based awards (in shares) | 1,555 | 2,567 | 2,321
Diluted shares outstanding (in shares) | 212,262 | 215,720 | 215,120
Basic earnings per share: |  |  |
Distributed earnings (in dollars per share) | $ 0.53 | $ 0.22 | $ 0.10
Undistributed earnings (in dollars per share) | $ 0.75 | $ 1.14 | $ 0.57
Basic earnings per share (in dollars per share) | $ 1.28 | $ 1.36 | $ 0.67
Diluted earnings per share: |  |  |
Distributed earnings (in dollars per share) | $ 0.53 | $ 0.22 | $ 0.10
Undistributed earnings (in dollars per share) | $ 0.74 | $ 1.13 | $ 0.57
Diluted earnings per share (in dollars per share) | $ 1.27 | $ 1.35 | $ 0.67
Restricted shares of common stock |  |  |
Less: Dividends paid |  |  |
Dividends | (2,103) | (848) | (353)
Undistributed earnings | $ 3,274 | $ 5,001 | $ 2,559
Basic shares outstanding : |  |  |
Basic shares outstanding (in shares) | 4,534 | 4,530 | 4,685
Diluted shares outstanding : |  |  |
Basic shares outstanding (in shares) | 4,534 | 4,530 | 4,685
Diluted shares outstanding (in shares) | 4,534 | 4,530 | 4,685
Basic earnings per share: |  |  |
Distributed earnings (in dollars per share) | $ 0.46 | $ 0.19 | $ 0.08
Undistributed earnings (in dollars per share) | $ 0.72 | $ 1.10 | $ 0.55
Basic earnings per share (in dollars per share) | $ 1.18 | $ 1.29 | $ 0.63

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