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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (USD $) In Thousands, except Share data | Total USD ($) | Common Stock [Member] | Additional paid-in capital [Member] USD ($) | Retained earnings [Member] USD ($) | Treasury stock [Member] USD ($) | Treasury stock reserved for deferred compensation [Member] USD ($) | Accumulated other comprehensive income (loss) [Member] USD ($) | Parent [Member] USD ($) | Noncontrolling interest [Member] USD ($)
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance, Beginning at Dec. 31, 2013 | $ 798,036 |  | $ 558,637 | $ 207,541 | $ (15,586) | $ (1,075) | $ (61,794) | $ 687,723 | $ 110,313
Balance, Beginning (in shares) at Dec. 31, 2013 |  | 53,560,872 |  |  |  |  |  |  |
Net loss | (30,019) |  |  | (18,348) |  |  |  | (18,348) | (11,671)
Currency translation adjustment | 8,214 |  |  |  |  |  | 9,788 | 9,788 | (1,574)
Pension liability adjustments, net of tax | 745 |  |  |  |  |  | 745 | 745 |
Dividends on common stock | (536) |  |  | (536) |  |  |  | (536) |
Exercise of stock options | 141 |  | 60 |  | 81 |  |  | 141 |
Exercise of stock options (in shares) |  | 8,971 |  |  |  |  |  |  |
Acquisition of additional interest | (13,395) |  | (49) |  |  |  | (1,153) | (1,202) | (12,193)
Stock-based compensation | 2,143 |  | 2,143 |  |  |  |  | 2,143 |
Tax benefit related to stock-based compensation | (45) |  | (45) |  |  |  |  | (45) |
Issuance of treasury stock under 401(k) plan | 332 |  | 170 |  | 162 |  |  | 332 |
Issuance of treasury stock under 401(k) plan (in shares) |  | 18,061 |  |  |  |  |  |  |
Balance, Ending at Jun. 30, 2014 | $ 765,616 |  | $ 560,916 | $ 188,657 | $ (15,343) | $ (1,075) | $ (52,414) | $ 680,741 | $ 84,875
Balance, Ending (in shares) at Jun. 30, 2014 |  | 53,587,904 |  |  |  |  |  |  |

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