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Shareholders' Equity and Equity Compensation (Additional Information) (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) offering_periods | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Lower limit of exercise price range | 50.00% |  |
Vesting period | 4 years |  |
Expiration period | 10 years |  |
Equity compensation expense | $ 11,818,000 | $ 11,275,000 | $ 9,643,000
Total intrinsic value of options exercised in period | 6,000,000 | 2,100,000 |
Cash received from exercise of options exercised | 3,100,000 | 4,100,000 |
Total grant-date fair value of stock options vested |  |  | 200,000
Employee Stock Purchase Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity compensation expense | $ 500,000 | 500,000 | 500,000
Employee stock purchase plan number of offering periods | offering_periods | 2 |  |
Employee stock purchase plan length of offering periods | 6 months |  |
Discount from market price percentage | 15.00% |  |
Equity Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration period | 10 years |  |
Nonvested awards, total compensation cost not yet recognized | $ 0 |  |
Equity compensation expense |  |  | 200,000
Performance Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Nonvested awards, total compensation cost not yet recognized | 5,900,000 |  |
Equity compensation expense | $ 4,700,000 | 4,600,000 | 3,200,000
Expected dividend yield | 0.00% |  |
Future compensation cost, period of recognition | 1 year 4 months 24 days |  |
Performance Shares | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance-based restricted stock award percentage target | 200.00% |  |
Performance Shares | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance-based restricted stock award percentage target | 0.00% |  |
Time Based Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Nonvested awards, total compensation cost not yet recognized | $ 7,300,000 |  |
Equity compensation expense | $ 5,700,000 | 5,600,000 | 5,000,000
Future compensation cost, period of recognition | 1 year 5 months 24 days |  |
Deferred Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity compensation expense | $ 1,000,000 | $ 700,000 | $ 800,000
Director |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration period | 10 years |  |
Vesting on the second anniversary after the grant date | Employee stock option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options vesting percentage | 33.33% |  |
Vesting on the third anniversary after the grant date | Employee stock option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options vesting percentage | 33.33% |  |
Vesting on the fourth anniversary after the grant date | Employee stock option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options vesting percentage | 33.34% |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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