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Shareholders' Equity and Equity Compensation (Additional Information) (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2015 USD ($) stock_purchase_right offering_periods $ / shares | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
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 |  |
Stock purchase right | stock_purchase_right | 1 |  |
Stock repurchase right exercise price (in dollars per share) | $ / shares | $ 240.00 |  |
Class of warrant or right, exercise price of warrants or rights (in dollars per share) | $ / shares | $ 0.01 |  |
Total intrinsic value of options exercised in period | $ 6,700 | $ 9,400 |
Cash received from exercise of options exercised | 7,000 | 20,500 |
Total grant-date fair value of stock options vested | 0 | 300 |
Stock-based compensation expense | 9,643 | 7,533 | $ 5,393
Employee Stock Purchase Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 500 | 500 | 500
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 |  |
Annual forfeiture rate | 3.00% |  |
Nonvested awards, total compensation cost not yet recognized | $ 0 |  |
Future compensation cost, period of recognition | 1 month |  |
Stock-based compensation expense | $ 200 | 300 | 400
Performance Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expected dividend yield | 0.00% |  |
Nonvested awards, total compensation cost not yet recognized | $ 6,000 |  |
Future compensation cost, period of recognition | 1 year 5 months |  |
Stock-based compensation expense | $ 3,200 | 2,300 | 1,300
Performance-based restricted stock measurement period | 3 years |  |
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 | $ 7,900 |  |
Future compensation cost, period of recognition | 1 year 6 months |  |
Stock-based compensation expense | $ 5,000 | 3,600 | 2,500
Deferred Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 800 | $ 800 | $ 700
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 The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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