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Equity Awards - Restricted Shares Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2017 | Sep. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restricted Shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of Unvested Restricted Shares Granted |  |  | 356,882 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period |  |  | 34,593 |  |
Unrecognized Compensation Cost |  |  | $ 5,700 |  |
Period for Recognition of Share-based Compensation Cost Not yet Recognized |  |  | 2 years |  |
Restricted shares-based compensation expense |  |  | $ 6,200 | $ 6,700 | $ 6,300
Restricted Shares [Member] | Non-employee independent director [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted shares issued related to director fee deferrals |  |  | 12,912 | 16,588 | 11,026
Plan 2 [Member] | Service-based restriced shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of Unvested Restricted Shares Granted |  |  |  | 42,740 | 42,937
Award requisite service period |  |  |  | 1 year |
Cash value of incentive plan |  |  |  | 80.00% |
Restriced shares value of incentive plan |  |  |  | 20.00% |
Plan 3 [Member] | Performance-based restriced shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of Unvested Restricted Shares Granted |  |  | 111,761 |  |
Award requisite service period |  |  | 3 years |  |
Risk-Free Interest Rate |  |  | 1.52% |  |
Expected Volatility |  |  | 35.60% |  |
Plan 5 [Member] | Service-based restriced shares [Member] | Non-employee independent director [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of Unvested Restricted Shares Granted |  |  | 30,429 | 41,174 | 32,040
Award requisite service period |  |  | 1 year |  |
Plan 9 [Member] | Performance-based restriced shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of Unvested Restricted Shares Granted |  |  |  | 198,956 |
Award requisite service period |  |  |  | 3 years |
Risk-Free Interest Rate |  |  |  | 0.96% |
Expected Volatility |  |  |  | 35.80% |
Plan 8 [Member] | Performance-based restriced shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of Unvested Restricted Shares Granted |  | 192,348 |  |  |
Risk-Free Interest Rate |  | 0.85% |  |  |
Expected Volatility |  | 35.80% |  |  |
Plan 7 [Member] | Service-based restriced shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of Unvested Restricted Shares Granted |  |  |  | 2,800 | 1,760
Award requisite service period |  |  |  | 1 year |
Plan 1 [Member] | Service-based restriced shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of Unvested Restricted Shares Granted |  |  | 189,062 | 235,251 | 209,825
Award requisite service period |  |  | 3 years |  |
Minimum [Member] | Plan 2 [Member] | Service-based restriced shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
ICP, Threshold target for granting stock awards |  |  |  | $ 20 |
3 year EPS CAGR metric [Member] | Minimum [Member] | Plan 3 [Member] | Performance-based restriced shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Amount of shares earned % of target award |  |  | 40.00% |  |
3 year EPS CAGR metric [Member] | Maximum [Member] | Plan 3 [Member] | Performance-based restriced shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award percentage earned based on metric over the performance period |  |  | 50.00% |  |
Amount of shares earned % of target award |  |  | 200.00% |  |
Total shareholder return metric [Member] | Minimum [Member] | Plan 3 [Member] | Performance-based restriced shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Amount of shares earned % of target award |  |  | 0.00% |  |
Total shareholder return metric [Member] | Minimum [Member] | Plan 9 [Member] | Performance-based restriced shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award percentage earned based on metric over the performance period |  |  |  | 0.00% |
Total shareholder return metric [Member] | Minimum [Member] | Plan 8 [Member] | Performance-based restriced shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award percentage earned based on metric over the performance period |  | 0.00% |  |  |
Total shareholder return metric [Member] | Maximum [Member] | Plan 3 [Member] | Performance-based restriced shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award percentage earned based on metric over the performance period |  |  | 50.00% |  |
Amount of shares earned % of target award |  |  | 200.00% |  |
Total shareholder return metric [Member] | Maximum [Member] | Plan 9 [Member] | Performance-based restriced shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award percentage earned based on metric over the performance period |  |  |  | 200.00% |
Total shareholder return metric [Member] | Maximum [Member] | Plan 8 [Member] | Performance-based restriced shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award percentage earned based on metric over the performance period |  | 200.00% |  |  |
EPS CAGR and cash generation metric [Member] [Member] | Plan 4 [Member] | Performance-based restriced shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award percentage attained |  |  |  | 121.10% |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period | 12,718 |  |  |  |

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- Definition Award percentage earned based on metric over the performance period. + References No definition available. + Details
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- Definition Percentage of the value of the incentive plan in earned cash. + References No definition available. + Details
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- Definition Incentive Compensation Plan, Threshold Target Award for Granting Stock Award. + References No definition available. + Details
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- Definition Percentage of the value of the incentive plan in restriced shares. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of shares issued pursuant to the terms of a deferred compensation arrangement. + 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 (l) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + 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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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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)(iv) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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