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v3.3.1.900

Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 2 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jul. 30, 2013 | Feb. 11, 2013 | Feb. 04, 2013 | Feb. 24, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Feb. 25, 2015
Common stock, authorized |  |  |  |  |  | 300,000,000 | 300,000,000 |  |
Preferred stock, authorized |  |  |  |  |  | 50,000,000 | 50,000,000 |  |
Preferred Stock, issued |  |  |  |  |  | 0 | 0 |  |
Preferred Stock, outstanding |  |  |  |  |  | 0 | 0 |  |
Common stock, issued |  |  |  |  |  | 43,412,660 | 43,282,201 |  |
Common stock, outstanding |  |  |  |  |  | 38,825,687 | 39,418,139 |  |
Net proceeds from issuance of common stock |  |  |  |  |  | $ 0 | $ 0 | $ 262,488 |
Reclassification of accumulated deficit to additional paid-in capital upon conversion from an LLC to a C Corporation |  |  |  |  |  |  |  | 0 |
Stock repurchase program, number of shares authorized for repurchase |  |  |  |  |  |  |  |  | 2,000,000
Treasury stock, acquired |  |  |  |  |  | 23,711 |  | 100,000 |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |  |  |  |
Beginning Balance, net of taxes |  |  |  | $ (121,229) | $ (93,015) | (101,498) | (55,249) | (121,229) |
Net actuarial gain (loss), current-period changes, before taxes |  |  |  |  |  | 8,406 | (75,016) | 97,171 |
Amortization of actuarial loss, amounts reclassified from accumulated other comprehensive loss, before taxes | [1] |  |  |  |  | 4,884 | (23) | 9,202 |
Effects of settlements, amounts reclassified from accumulated other comprehensive loss, before taxes | [1] |  |  |  |  | 501 | 0 | 0 |
Amortization of prior service costs and other, amounts reclassified from accumulated other comprehensive loss, before taxes | [1] |  |  |  |  | 0 | 0 | 304 |
Income taxes |  |  |  |  |  | (5,308) | 28,790 | (40,697) |
Ending Balance, net of taxes |  |  |  |  |  | $ (93,015) | $ (101,498) | (55,249) |
Retained Earnings (Accumulated Deficit) [Member] |  |  |  |  |  |  |  |  |
Reclassification of accumulated deficit to additional paid-in capital upon conversion from an LLC to a C Corporation |  |  |  | 32,000 |  |  |  | 32,000 |
Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |  |
Reclassification of accumulated deficit to additional paid-in capital upon conversion from an LLC to a C Corporation |  |  |  | $ (32,000) |  |  |  | $ (32,000) |
Treasury Stock [Member] |  |  |  |  |  |  |  |  |
Treasury stock, shares acquired |  |  |  |  |  | 722,911.000 |  | 3,864,000 |
Treasury stock, acquired |  |  |  |  |  | $ 23,711 |  | $ 100,000 |
Treasury stock acquired, average cost per share |  |  |  |  |  | $ 32.80 |  |  |
Treasury Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Treasury stock, shares acquired |  |  |  |  | 180,100 |  |  |  |
Treasury stock, acquired |  |  |  |  | $ 2,600 |  |  |  |
Treasury stock acquired, average cost per share |  |  |  |  | $ 14.62 |  |  |  |
Majority Shareholder [Member] |  |  |  |  |  |  |  |  |
Treasury stock, acquired |  | $ 100,000 |  |  |  |  |  |  |
Treasury stock, shares acquired |  | 3,864,062 |  |  |  |  |  |  |
IPO [Member] |  |  |  |  |  |  |  |  |
Shares of common stock issued in IPO |  |  | 13,529,412 |  |  |  |  |  |
Net proceeds from issuance of common stock |  |  | $ 262,500 |  |  |  |  |  |
Payments of Underwriting Discounts And Commissions |  |  | 19,200 |  |  |  |  |  |
Offering expenses |  |  | $ 2,500 |  |  |  |  |  |
[1] | Represents amounts reclassified from accumulated other comprehensive loss. These amounts are included in the computation of net periodic pension cost. For additional information, see Note 7, Retirement and Benefit Plans.

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