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Stockholders' Equity and Stock Incentive Plans (Restricted Stock Units, Performance Stock Units and Career Shares) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense | $ 25,379 | $ 17,413 | $ 15,518
Restricted Stock Units (RSUs) |  |  |
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 | 510,989 | 442,879 | 542,220
Share-based compensation expense | $ 10,219 | $ 7,463 | $ 8,883
Non-Option Award Activity [Roll Forward] |  |  |
Outstanding, beginning of period | 1,637,212 | 1,961,118 | 2,320,826
Canceled | (18,250) | (38,964) | (30,400)
Vested / awarded | (416,084) | (727,821) | (871,528)
Outstanding, end of period | 1,713,867 | 1,637,212 | 1,961,118
Granted, weighted average grant date fair value (in USD per share) | $ 25.05 | $ 27.40 | $ 18.06
Total unrecognized share-based compensation costs related to unvested stock options | $ 0 |  |
Total unrecognized share-based compensation costs related to unvested stock options, period for recognition | 2 years 7 months 7 days |  |
Performance Stock Units (PSUs) |  |  |
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 | 287,374 | 275,305 | 241,235
Share-based compensation expense | $ 13,647 | $ 7,381 | $ 3,353
Non-Option Award Activity [Roll Forward] |  |  |
Outstanding, beginning of period | 1,062,547 | 1,129,078 | 1,249,480
Canceled | (2,450) | 0 | 0
Vested / awarded | (486,805) | (268,429) | (213,365)
Outstanding, end of period | 1,037,420 | 1,062,547 | 1,129,078
Granted, weighted average grant date fair value (in USD per share) | $ 24.42 | $ 28.94 | $ 17.75
Total unrecognized share-based compensation costs related to unvested stock options | $ 7,600 |  |
Total unrecognized share-based compensation costs related to unvested stock options, period for recognition | 2 years 8 months 13 days |  |
Shares to be issued to settle PSUs | 1,400,000 |  |
Evaluation of performance conditions, period | 3 years |  |
Awards if no conditions met, percentage | 0.00% |  |
Awards if only threshhold performance met, percentage | 50.00% |  |
Awards for target performance, percentage | 100.00% |  |
Awards for maximum performance, percentage (up to 200%) | 200.00% |  |
Award vesting period | 3 years |  |
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense | $ 154 | $ 1,193 | $ 1,974
Non-Option Award Activity [Roll Forward] |  |  |
Total unrecognized share-based compensation costs related to unvested stock options | $ 100 |  |
Total unrecognized share-based compensation costs related to unvested stock options, period for recognition | 10 months 7 days |  |
Performance Shares Adjustment [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 | 176,754 | (73,407) | (148,272)
Career Shares |  |  |
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 | 40,492 | 66,000 | 73,064
Share-based compensation expense | $ 1,359 | $ 1,376 | $ 1,308
Non-Option Award Activity [Roll Forward] |  |  |
Outstanding, beginning of period | 1,013,459 | 1,041,639 | 968,575
Canceled | (5,335) | (11,236) | 0
Vested / awarded | (27,331) | (82,944) | 0
Outstanding, end of period | 1,021,285 | 1,013,459 | 1,041,639
Granted, weighted average grant date fair value (in USD per share) | $ 34.48 | $ 20.41 | $ 19.01
Total unrecognized share-based compensation costs related to unvested stock options | $ 1,000 |  |
Executive Officer | Career Shares |  |  |
Non-Option Award Activity [Roll Forward] |  |  |
Award eligibility, minimum age | 55 years |  |
Award requisite service period | 10 years |  |
Service period, Tranche 1 | 10 years |  |
Service period, Tranche 2 | 15 years |  |
Service period, Tranche 3 | 20 years |  |
Stock Incentive Plan 2012 [Member] | Stock Options |  |  |
Non-Option Award Activity [Roll Forward] |  |  |
Award vesting period | 3 years |  |
Common Stock |  |  |
Non-Option Award Activity [Roll Forward] |  |  |
Stock Issued During Period, Shares, Performance Stock Award, Net | 337,537 | 173,653 | 159,027
Common Stock | PSU - Dec 2014 [Domain] |  |  |
Non-Option Award Activity [Roll Forward] |  |  |
Shares to be issued to settle PSUs | 1.57 |  |
Stock Issued During Period, Shares, Performance Stock Award, Gross | 486,805 |  |
Stock Issued During Period, Shares, Performance Stock Award, Taxes | 149,268 |  |
Stock Issued During Period, Shares, Performance Stock Award, Net | 337,537 |  |
Common Stock | PSU - Nov 2013 [Domain] |  |  |
Non-Option Award Activity [Roll Forward] |  |  |
Shares to be issued to settle PSUs | 0.80 |  |
Stock Issued During Period, Shares, Performance Stock Award, Gross | 268,429 |  |
Stock Issued During Period, Shares, Performance Stock Award, Taxes | 94,776 |  |
Stock Issued During Period, Shares, Performance Stock Award, Net | 173,653 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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