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Share Based Compensation, 401(k) Plan and Deferred Compensation (Textual) (Details) - USD ($) |  |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May. 28, 2015 | Mar. 10, 2015 | Feb. 01, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Feb. 23, 2015 | Feb. 06, 2015 | Mar. 12, 2014 | Mar. 11, 2014 | Feb. 25, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  |  | 2,624,067 | 2,684,795 |  |  |  |  |  |
Stock-based compensation expense |  |  |  | $ 7,300,000 | $ 6,100,000 | $ 8,300,000 |  |  |  |  |
Stock-based compensation expense, capitalized |  |  |  | 1,900,000 | 1,700,000 | 1,400,000 |  |  |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount |  |  |  | $ 400,000 | $ 400,000 | 400,000 |  |  |  |  |
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent |  |  |  | 100.00% |  |  |  |  |  |  |
Common shares issued for share based compensation |  |  |  | 5,097 |  |  |  |  |  |  |
Number of shares to be issued under deferred compensation plan included in total shares outstanding |  |  |  | 700,000 | 400,000 |  |  |  |  |  |
Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  |  | 2,624,067 |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  | $ 0 | $ 0 | 700,000 |  |  |  |  |
Stock-based compensation expense, capitalized |  |  |  | 0 | 0 | 100,000 |  |  |  |  |
Restricted Share Awards [Member] |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  | $ 2,400,000 | $ 2,700,000 | 3,200,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number |  |  |  | 506,147 | 540,066 |  |  |  |  |  |
Vesting period |  |  |  | 3 years |  |  |  |  |  |  |
Unrecognized compensation expenses |  |  |  | $ 2,400,000 |  |  |  |  |  |  |
Weighted average period over which options will be recognized |  |  |  | 1 year 7 months 6 days |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost |  |  |  | $ 700,000 | $ 600,000 | 600,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  | three years from the initial grant dates |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  | 186,791 |  |  |  |  |  |  |
Voluntary Termination Of Employment Terms |  |  |  | after reaching at least age 57 and accumulating at least 15 years of service with the Company |  |  |  |  |  |  |
Accumulated Service Period For Voluntary Termination |  |  |  | 15 years |  |  |  |  |  |  |
Restricted Share Awards [Member] | Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Voluntary Termination of Employment Age Limit |  |  |  | 57 years |  |  |  |  |  |  |
Restricted Share Awards [Member] | Cliff Vest After Three Years [Member] | Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  | 119,136 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights |  |  |  | after three years from the grant date |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Cliff Vesting, Minimum |  |  |  | 3 years |  |  |  |  |  |  |
Restricted Share Awards [Member] | Vest Ratably Over Three Years [Member] |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period | 3 years |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 34,006 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights |  |  |  | ratably over three years |  |  |  |  |  |  |
Restricted Share Awards [Member] | Vest Ratably Over Three Years [Member] | Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period |  | 2 years |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  | 33,649 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights |  |  |  | ratably over two years |  |  |  |  |  |  |
Restricted Performance Share Units Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  | $ 4,200,000 | 3,200,000 | 4,400,000 |  |  |  |  |
Unrecognized compensation expenses |  |  |  | $ 2,000,000 |  |  |  |  |  |  |
Weighted average period over which options will be recognized |  |  |  | 1 year |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost |  |  |  | $ 1,200,000 | $ 1,100,000 | 800,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  | 3 year |  |  |  |  |  |  |
Common shares issued for share based compensation |  |  | 486,056 |  |  |  |  |  |  |  |
Dividends Payable, Amount Per Share |  |  |  |  |  |  |  | $ 0.15 |  |  |
Restricted Performance Share Units Plan [Member] | Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number |  |  |  | 555,589 | 392,014 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  | 186,395 |  |  |  |  |  |  |
Aggregate share-based awards awarded to executives |  |  |  |  |  |  | 186,395 |  | 61,720 | 134,284 | 231,093
Restricted Performance Share Units Plan [Member] | Cliff Vest After Three Years [Member] | Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights |  |  |  | three year cliff vesting period |  |  |  |  |  |  |
Employee Share Purchase Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  | $ 100,000 | $ 100,000 | 100,000 |  |  |  |  |
Share purchases made by employees under ESPP |  |  |  | 85% of the average closing price per share for a specified period |  |  |  |  |  |  |
Maximum participant contribution, percentage of compensation |  |  |  | 20.00% |  |  |  |  |  |  |
Maximum participant contribution, dollar amount |  |  |  | $ 50,000 |  |  |  |  |  |  |
Aggregate share-based awards awarded to executives |  |  |  | 1,250,000 |  |  |  |  |  |  |
Stock Issued During Period, Value, Employee Stock Purchase Plan |  |  |  | $ 500,000 | 400,000 | 400,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date |  |  |  | 15.00% |  |  |  |  |  |  |
Deferred Compensation Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred compensation arrangement with individual increase in compensation expense. |  |  |  | $ 0 | $ 0 | $ 200,000 |  |  |  |  |

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Namespace Prefix: |
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Balance Type: |
Period Type: |

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Namespace Prefix: |
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Balance Type: |
Period Type: |

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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |