Accumulated service period for voluntary termination.

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'Maximum participant contribution, expressed as a dollar amount.

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Maximum participant contribution, expressed as a percentage of their compensation.

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Number of shares to be issued under deferred compensation plan included in shares outstanding.

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Number of vesting installments.

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Share based compensation arrangement by share based payment award terms of purchase common shares under ESPP.

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Share-based compensation arrangement by share-based payment award vesting date.

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Share based compensation arrangement by share based payment award vesting period1.

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Voluntary termination of employment age limit.

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Voluntary termination of employment terms.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Amount of discretionary contributions made by an employer to a defined contribution plan.

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Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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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.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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Discount rate from fair value on purchase date that participants pay for shares.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Number of options outstanding, including both vested and non-vested options.

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Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.

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Share Based Compensation, 401(k) Plan and Deferred Compensation (Textual) (Details)					12 Months Ended
	May 18, 2017 shares	Mar. 07, 2017 Installment shares	Mar. 01, 2017 shares	Feb. 01, 2017 shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($)	Feb. 06, 2017 $ / shares	Feb. 22, 2016 shares	Feb. 23, 2015 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number \| shares					2,238,590	2,377,778
Share-based compensation expense \| $					$ 6,300,000	$ 5,600,000	$ 7,300,000
Share-based compensation expense, capitalized \| $					1,200,000	1,000,000	1,900,000
Defined Contribution Plan, Employer Discretionary Contribution Amount \| $					$ 500,000	$ 400,000	400,000
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent					100.00%
Aggregate share-based awards awarded to executives \| shares	6,500,000
Number of shares to be issued under deferred compensation plan included in total shares outstanding \| shares					900,000	900,000
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 \| shares					2,238,590
Share-based compensation expense \| $					$ 0	$ 0
Share-based compensation expense, capitalized \| $					0	0
Restricted Share Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense \| $					2,800,000	2,600,000	2,400,000
Share-based compensation expense, capitalized \| $					$ 400,000	$ 400,000	700,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number \| shares					455,643	488,604
Unrecognized compensation expenses \| $					$ 2,100,000
Weighted average period over which options will be recognized					1 year 3 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period					two to three years from the initial grant dates
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period \| shares					170,192
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] \| Non-Officer Employees [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 \| shares		32,122
Number of Vesting Installments \| Installment		2
Restricted Share Awards [Member] \| Cliff Vest [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 \| shares			109,629
Share Based Compensation Arrangement By Share Based Payment Award, Vesting Date			Apr. 15, 2020
Restricted Share Awards [Member] \| Installment One [Member] \| Non-Officer Employees [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award, Vesting Date		Apr. 15, 2018
Restricted Share Awards [Member] \| Installment Two [Member] \| Non-Officer Employees [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award, Vesting Date		Apr. 15, 2019
Restricted Share Awards [Member] \| Ratable Vesting
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 \| shares	28,441
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights					ratably over three years
Restricted Share Awards [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period					3 years
Restricted Share Awards [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period					2 years
Restricted Performance Share Units Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense \| $					$ 3,400,000	$ 2,800,000	4,200,000
Share-based compensation expense, capitalized \| $					$ 800,000	600,000	1,200,000
Unrecognized compensation expenses \| $						$ 1,700,000
Weighted average period over which options will be recognized					1 year 1 month 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period					3 year
Common shares issued for share based compensation \| shares				55,299
Dividends Payable, Amount Per Share \| $ / shares								$ 0.16
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 \| shares					545,803	378,977
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period \| shares					174,854
Aggregate share-based awards awarded to executives \| shares			174,854						231,388	186,395
Restricted Performance Share Units Plan [Member] \| Cliff Vest [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]
Share-based compensation expense \| $					$ 100,000	$ 200,000	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 \| shares					1,250,000
Stock Issued During Period, Value, Employee Stock Purchase Plan \| $					$ 400,000	$ 400,000	$ 500,000
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date					15.00%