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Shareholders' Equity and Stock-Based Compensation (Details 2) (USD $) | 0 Months Ended | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 18, 2013 | Jan. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Summary of common shares issued, treasury shares and shares outstanding |  |  |  |  |
Balance at the beginning of the period (in shares) |  | 48,304,000 us-gaap_CommonStockSharesOutstanding | 45,281,329 us-gaap_CommonStockSharesOutstanding | 48,304,000 us-gaap_CommonStockSharesOutstanding | 51,073,000 us-gaap_CommonStockSharesOutstanding
Stock options exercised (in shares) |  |  |  | 8,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 174,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Share repurchases (in shares) |  |  | (4,852,000)us-gaap_TreasuryStockSharesAcquired | (3,493,000)us-gaap_TreasuryStockSharesAcquired | (3,606,000)us-gaap_TreasuryStockSharesAcquired
Restricted stock shares and restricted stock units (in shares) |  |  | 262,000 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures | 256,000 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures | 396,000 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
Other (in shares) |  |  | 167,000 us-gaap_StockIssuedDuringPeriodSharesOther | 206,000 us-gaap_StockIssuedDuringPeriodSharesOther | 267,000 us-gaap_StockIssuedDuringPeriodSharesOther
Balance at the end of the period (in shares) |  |  | 40,858,006 us-gaap_CommonStockSharesOutstanding | 45,281,329 us-gaap_CommonStockSharesOutstanding | 48,304,000 us-gaap_CommonStockSharesOutstanding
Common Stock |  |  |  |  |
Authorized shares |  |  | 200,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Par value (in dollars per share) |  |  | 10.00 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Summary of common shares issued, treasury shares and shares outstanding |  |  |  |  |
Balance at the beginning of the period (in shares) |  | 99,454,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 99,801,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 99,454,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 98,702,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Stock options exercised (in shares) |  |  |  | 8,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 174,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Restricted stock shares and restricted stock units (in shares) |  |  | 96,000 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 133,000 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 311,000 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Other (in shares) |  |  | 167,000 us-gaap_StockIssuedDuringPeriodSharesOther / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 206,000 us-gaap_StockIssuedDuringPeriodSharesOther / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 267,000 us-gaap_StockIssuedDuringPeriodSharesOther / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Balance at the end of the period (in shares) |  |  | 100,064,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 99,801,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 99,454,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Common Stock In Treasury |  |  |  |  |
Summary of common shares issued, treasury shares and shares outstanding |  |  |  |  |
Balance at the beginning of the period (in shares) |  | (51,150,000)us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (54,520,000)us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (51,150,000)us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (47,629,000)us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Share repurchases (in shares) | (115,000)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (1,514,000)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (4,852,000)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (3,493,000)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (3,606,000)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Restricted stock shares and restricted stock units (in shares) |  |  | 166,000 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 123,000 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 85,000 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Balance at the end of the period (in shares) |  |  | (59,206,000)us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (54,520,000)us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (51,150,000)us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember

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