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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense | $ 17,413 | $ 15,518 | $ 19,264
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 | 442,879 | 542,220 | 541,016
Share-based compensation expense | $ 7,463 | $ 8,883 | $ 9,909
Non-Option Award Activity [Roll Forward] |  |  |
Outstanding, beginning of period | 1,961,118 | 2,320,826 | 2,534,496
Canceled | (38,964) | (30,400) | (40,800)
Vested / awarded | (727,821) | (871,528) | (713,886)
Outstanding, end of period | 1,637,212 | 1,961,118 | 2,320,826
Granted, weighted average grant date fair value (in USD per share) | $ 27.40 | $ 18.06 | $ 19.05
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 6 months 2 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 | 275,305 | 241,235 | 240,160
Share-based compensation expense | $ 7,381 | $ 3,353 | $ 5,135
Non-Option Award Activity [Roll Forward] |  |  |
Outstanding, beginning of period | 1,129,078 | 1,249,480 | 1,411,640
Canceled | 0 | 0 | (2,677)
Vested / awarded | (268,429) | (213,365) | (663,945)
Outstanding, end of period | 1,062,547 | 1,129,078 | 1,249,480
Granted, weighted average grant date fair value (in USD per share) | $ 28.94 | $ 17.75 | $ 16.75
Total unrecognized share-based compensation costs related to unvested stock options | $ 6,900 |  |
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 | $ 1,193 | $ 1,974 | $ 2,821
Non-Option Award Activity [Roll Forward] |  |  |
Total unrecognized share-based compensation costs related to unvested stock options | $ 200 |  |
Total unrecognized share-based compensation costs related to unvested stock options, period for recognition | 1 year 4 months 26 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 | (73,407) | (148,272) | 264,306
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 | 66,000 | 73,064 | 103,018
Share-based compensation expense | $ 1,376 | $ 1,308 | $ 1,399
Non-Option Award Activity [Roll Forward] |  |  |
Outstanding, beginning of period | 1,041,639 | 968,575 | 896,585
Canceled | (11,236) | 0 | 0
Vested / awarded | (82,944) | 0 | (31,028)
Outstanding, end of period | 1,013,459 | 1,041,639 | 968,575
Granted, weighted average grant date fair value (in USD per share) | $ 20.41 | $ 19.01 | $ 12.51
Total unrecognized share-based compensation costs related to unvested stock options | $ 1,100 |  |
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 | 173,653 | 159,027 | 481,749
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 |  |
Common Stock | PSU - Dec 2012 [Domain] |  |  |
Non-Option Award Activity [Roll Forward] |  |  |
Shares to be issued to settle PSUs | 0.59 |  |
Stock Issued During Period, Shares, Performance Stock Award, Gross | 213,365 |  |
Stock Issued During Period, Shares, Performance Stock Award, Taxes | 54,338 |  |
Stock Issued During Period, Shares, Performance Stock Award, Net | 159,027 |  |

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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 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://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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